diff --git a/packages/react-dom/src/client/ReactDOMComponent.js b/packages/react-dom/src/client/ReactDOMComponent.js
index 19eb70e583b39..93c1534c235b4 100644
--- a/packages/react-dom/src/client/ReactDOMComponent.js
+++ b/packages/react-dom/src/client/ReactDOMComponent.js
@@ -283,7 +283,6 @@ export function trapClickOnNonInteractiveElement(node: HTMLElement) {
 function setInitialDOMProperties(
   tag: string,
   domElement: Element,
-  rootContainerElement: Element | Document | DocumentFragment,
   nextProps: Object,
   isCustomComponentTag: boolean,
 ): void {
@@ -487,7 +486,6 @@ export function setInitialProperties(
   domElement: Element,
   tag: string,
   rawProps: Object,
-  rootContainerElement: Element | Document | DocumentFragment,
 ): void {
   const isCustomComponentTag = isCustomComponent(tag, rawProps);
   if (__DEV__) {
@@ -571,13 +569,7 @@ export function setInitialProperties(
 
   assertValidProps(tag, props);
 
-  setInitialDOMProperties(
-    tag,
-    domElement,
-    rootContainerElement,
-    props,
-    isCustomComponentTag,
-  );
+  setInitialDOMProperties(tag, domElement, props, isCustomComponentTag);
 
   switch (tag) {
     case 'input':
@@ -613,7 +605,6 @@ export function diffProperties(
   tag: string,
   lastRawProps: Object,
   nextRawProps: Object,
-  rootContainerElement: Element | Document | DocumentFragment,
 ): null | Array<mixed> {
   if (__DEV__) {
     validatePropertiesInDevelopment(tag, nextRawProps);
@@ -866,7 +857,6 @@ export function diffHydratedProperties(
   tag: string,
   rawProps: Object,
   parentNamespace: string,
-  rootContainerElement: Element | Document | DocumentFragment,
   isConcurrentMode: boolean,
   shouldWarnDev: boolean,
 ): null | Array<mixed> {
diff --git a/packages/react-dom/src/client/ReactDOMHostConfig.js b/packages/react-dom/src/client/ReactDOMHostConfig.js
index 3744bbdcdd370..12a14df0f1c14 100644
--- a/packages/react-dom/src/client/ReactDOMHostConfig.js
+++ b/packages/react-dom/src/client/ReactDOMHostConfig.js
@@ -181,7 +181,6 @@ export function getRootHostContext(
 export function getChildHostContext(
   parentHostContext: HostContext,
   type: string,
-  rootContainerInstance: Container,
 ): HostContext {
   if (__DEV__) {
     const parentHostContextDev = ((parentHostContext: any): HostContextDev);
@@ -289,10 +288,9 @@ export function finalizeInitialChildren(
   domElement: Instance,
   type: string,
   props: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): boolean {
-  setInitialProperties(domElement, type, props, rootContainerInstance);
+  setInitialProperties(domElement, type, props);
   switch (type) {
     case 'button':
     case 'input':
@@ -311,7 +309,6 @@ export function prepareUpdate(
   type: string,
   oldProps: Props,
   newProps: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): null | Array<mixed> {
   if (__DEV__) {
@@ -329,13 +326,7 @@ export function prepareUpdate(
       validateDOMNesting(null, string, ownAncestorInfo);
     }
   }
-  return diffProperties(
-    domElement,
-    type,
-    oldProps,
-    newProps,
-    rootContainerInstance,
-  );
+  return diffProperties(domElement, type, oldProps, newProps);
 }
 
 export function shouldSetTextContent(type: string, props: Props): boolean {
@@ -828,7 +819,6 @@ export function hydrateInstance(
   instance: Instance,
   type: string,
   props: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
   internalInstanceHandle: Object,
   shouldWarnDev: boolean,
@@ -855,7 +845,6 @@ export function hydrateInstance(
     type,
     props,
     parentNamespace,
-    rootContainerInstance,
     isConcurrentMode,
     shouldWarnDev,
   );
diff --git a/packages/react-native-renderer/src/ReactFabricHostConfig.js b/packages/react-native-renderer/src/ReactFabricHostConfig.js
index 515c4e0f9665c..c5c029006578f 100644
--- a/packages/react-native-renderer/src/ReactFabricHostConfig.js
+++ b/packages/react-native-renderer/src/ReactFabricHostConfig.js
@@ -404,7 +404,6 @@ export function finalizeInitialChildren(
   parentInstance: Instance,
   type: string,
   props: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): boolean {
   return false;
@@ -419,7 +418,6 @@ export function getRootHostContext(
 export function getChildHostContext(
   parentHostContext: HostContext,
   type: string,
-  rootContainerInstance: Container,
 ): HostContext {
   const prevIsInAParentText = parentHostContext.isInAParentText;
   const isInAParentText =
@@ -453,7 +451,6 @@ export function prepareUpdate(
   type: string,
   oldProps: Props,
   newProps: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): null | Object {
   const viewConfig = instance.canonical.viewConfig;
diff --git a/packages/react-native-renderer/src/ReactNativeHostConfig.js b/packages/react-native-renderer/src/ReactNativeHostConfig.js
index 10c5e37f41bcc..5b03399e103f4 100644
--- a/packages/react-native-renderer/src/ReactNativeHostConfig.js
+++ b/packages/react-native-renderer/src/ReactNativeHostConfig.js
@@ -166,7 +166,6 @@ export function finalizeInitialChildren(
   parentInstance: Instance,
   type: string,
   props: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): boolean {
   // Don't send a no-op message over the bridge.
@@ -199,7 +198,6 @@ export function getRootHostContext(
 export function getChildHostContext(
   parentHostContext: HostContext,
   type: string,
-  rootContainerInstance: Container,
 ): HostContext {
   const prevIsInAParentText = parentHostContext.isInAParentText;
   const isInAParentText =
@@ -230,7 +228,6 @@ export function prepareUpdate(
   type: string,
   oldProps: Props,
   newProps: Props,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): null | Object {
   return UPDATE_SIGNAL;
diff --git a/packages/react-noop-renderer/src/createReactNoop.js b/packages/react-noop-renderer/src/createReactNoop.js
index df2b3a839a521..858c562d48bf5 100644
--- a/packages/react-noop-renderer/src/createReactNoop.js
+++ b/packages/react-noop-renderer/src/createReactNoop.js
@@ -276,11 +276,7 @@ function createReactNoop(reconciler: Function, useMutation: boolean) {
       return NO_CONTEXT;
     },
 
-    getChildHostContext(
-      parentHostContext: HostContext,
-      type: string,
-      rootcontainerInstance: Container,
-    ) {
+    getChildHostContext(parentHostContext: HostContext, type: string) {
       if (type === 'offscreen') {
         return parentHostContext;
       }
diff --git a/packages/react-reconciler/src/ReactFiberCompleteWork.new.js b/packages/react-reconciler/src/ReactFiberCompleteWork.new.js
index e1d24857c93b3..7a8843941eee5 100644
--- a/packages/react-reconciler/src/ReactFiberCompleteWork.new.js
+++ b/packages/react-reconciler/src/ReactFiberCompleteWork.new.js
@@ -255,7 +255,6 @@ if (supportsMutation) {
     workInProgress: Fiber,
     type: Type,
     newProps: Props,
-    rootContainerInstance: Container,
   ) {
     // If we have an alternate, that means this is an update and we need to
     // schedule a side-effect to do the updates.
@@ -280,7 +279,6 @@ if (supportsMutation) {
       type,
       oldProps,
       newProps,
-      rootContainerInstance,
       currentHostContext,
     );
     // TODO: Type this specific to this type of component.
@@ -458,7 +456,6 @@ if (supportsMutation) {
     workInProgress: Fiber,
     type: Type,
     newProps: Props,
-    rootContainerInstance: Container,
   ) {
     const currentInstance = current.stateNode;
     const oldProps = current.memoizedProps;
@@ -480,7 +477,6 @@ if (supportsMutation) {
         type,
         oldProps,
         newProps,
-        rootContainerInstance,
         currentHostContext,
       );
     }
@@ -501,13 +497,7 @@ if (supportsMutation) {
       recyclableInstance,
     );
     if (
-      finalizeInitialChildren(
-        newInstance,
-        type,
-        newProps,
-        rootContainerInstance,
-        currentHostContext,
-      )
+      finalizeInitialChildren(newInstance, type, newProps, currentHostContext)
     ) {
       markUpdate(workInProgress);
     }
@@ -555,7 +545,6 @@ if (supportsMutation) {
     workInProgress: Fiber,
     type: Type,
     newProps: Props,
-    rootContainerInstance: Container,
   ) {
     // Noop
   };
@@ -964,16 +953,9 @@ function completeWork(
     }
     case HostComponent: {
       popHostContext(workInProgress);
-      const rootContainerInstance = getRootHostContainer();
       const type = workInProgress.type;
       if (current !== null && workInProgress.stateNode != null) {
-        updateHostComponent(
-          current,
-          workInProgress,
-          type,
-          newProps,
-          rootContainerInstance,
-        );
+        updateHostComponent(current, workInProgress, type, newProps);
 
         if (current.ref !== workInProgress.ref) {
           markRef(workInProgress);
@@ -1002,17 +984,14 @@ function completeWork(
           // TODO: Move this and createInstance step into the beginPhase
           // to consolidate.
           if (
-            prepareToHydrateHostInstance(
-              workInProgress,
-              rootContainerInstance,
-              currentHostContext,
-            )
+            prepareToHydrateHostInstance(workInProgress, currentHostContext)
           ) {
             // If changes to the hydrated node need to be applied at the
             // commit-phase we mark this as such.
             markUpdate(workInProgress);
           }
         } else {
+          const rootContainerInstance = getRootHostContainer();
           const instance = createInstance(
             type,
             newProps,
@@ -1033,7 +1012,6 @@ function completeWork(
               instance,
               type,
               newProps,
-              rootContainerInstance,
               currentHostContext,
             )
           ) {
diff --git a/packages/react-reconciler/src/ReactFiberCompleteWork.old.js b/packages/react-reconciler/src/ReactFiberCompleteWork.old.js
index 10f8e43e35bd8..1ff1a5173ec10 100644
--- a/packages/react-reconciler/src/ReactFiberCompleteWork.old.js
+++ b/packages/react-reconciler/src/ReactFiberCompleteWork.old.js
@@ -255,7 +255,6 @@ if (supportsMutation) {
     workInProgress: Fiber,
     type: Type,
     newProps: Props,
-    rootContainerInstance: Container,
   ) {
     // If we have an alternate, that means this is an update and we need to
     // schedule a side-effect to do the updates.
@@ -280,7 +279,6 @@ if (supportsMutation) {
       type,
       oldProps,
       newProps,
-      rootContainerInstance,
       currentHostContext,
     );
     // TODO: Type this specific to this type of component.
@@ -458,7 +456,6 @@ if (supportsMutation) {
     workInProgress: Fiber,
     type: Type,
     newProps: Props,
-    rootContainerInstance: Container,
   ) {
     const currentInstance = current.stateNode;
     const oldProps = current.memoizedProps;
@@ -480,7 +477,6 @@ if (supportsMutation) {
         type,
         oldProps,
         newProps,
-        rootContainerInstance,
         currentHostContext,
       );
     }
@@ -501,13 +497,7 @@ if (supportsMutation) {
       recyclableInstance,
     );
     if (
-      finalizeInitialChildren(
-        newInstance,
-        type,
-        newProps,
-        rootContainerInstance,
-        currentHostContext,
-      )
+      finalizeInitialChildren(newInstance, type, newProps, currentHostContext)
     ) {
       markUpdate(workInProgress);
     }
@@ -555,7 +545,6 @@ if (supportsMutation) {
     workInProgress: Fiber,
     type: Type,
     newProps: Props,
-    rootContainerInstance: Container,
   ) {
     // Noop
   };
@@ -964,16 +953,9 @@ function completeWork(
     }
     case HostComponent: {
       popHostContext(workInProgress);
-      const rootContainerInstance = getRootHostContainer();
       const type = workInProgress.type;
       if (current !== null && workInProgress.stateNode != null) {
-        updateHostComponent(
-          current,
-          workInProgress,
-          type,
-          newProps,
-          rootContainerInstance,
-        );
+        updateHostComponent(current, workInProgress, type, newProps);
 
         if (current.ref !== workInProgress.ref) {
           markRef(workInProgress);
@@ -1002,17 +984,14 @@ function completeWork(
           // TODO: Move this and createInstance step into the beginPhase
           // to consolidate.
           if (
-            prepareToHydrateHostInstance(
-              workInProgress,
-              rootContainerInstance,
-              currentHostContext,
-            )
+            prepareToHydrateHostInstance(workInProgress, currentHostContext)
           ) {
             // If changes to the hydrated node need to be applied at the
             // commit-phase we mark this as such.
             markUpdate(workInProgress);
           }
         } else {
+          const rootContainerInstance = getRootHostContainer();
           const instance = createInstance(
             type,
             newProps,
@@ -1033,7 +1012,6 @@ function completeWork(
               instance,
               type,
               newProps,
-              rootContainerInstance,
               currentHostContext,
             )
           ) {
diff --git a/packages/react-reconciler/src/ReactFiberHostContext.new.js b/packages/react-reconciler/src/ReactFiberHostContext.new.js
index e7d9433136ad9..282414a658cba 100644
--- a/packages/react-reconciler/src/ReactFiberHostContext.new.js
+++ b/packages/react-reconciler/src/ReactFiberHostContext.new.js
@@ -75,11 +75,8 @@ function getHostContext(): HostContext {
 }
 
 function pushHostContext(fiber: Fiber): void {
-  const rootInstance: Container = requiredContext(
-    rootInstanceStackCursor.current,
-  );
   const context: HostContext = requiredContext(contextStackCursor.current);
-  const nextContext = getChildHostContext(context, fiber.type, rootInstance);
+  const nextContext = getChildHostContext(context, fiber.type);
 
   // Don't push this Fiber's context unless it's unique.
   if (context === nextContext) {
diff --git a/packages/react-reconciler/src/ReactFiberHostContext.old.js b/packages/react-reconciler/src/ReactFiberHostContext.old.js
index 667aeaf0ddefc..a4735b4bb6976 100644
--- a/packages/react-reconciler/src/ReactFiberHostContext.old.js
+++ b/packages/react-reconciler/src/ReactFiberHostContext.old.js
@@ -75,11 +75,8 @@ function getHostContext(): HostContext {
 }
 
 function pushHostContext(fiber: Fiber): void {
-  const rootInstance: Container = requiredContext(
-    rootInstanceStackCursor.current,
-  );
   const context: HostContext = requiredContext(contextStackCursor.current);
-  const nextContext = getChildHostContext(context, fiber.type, rootInstance);
+  const nextContext = getChildHostContext(context, fiber.type);
 
   // Don't push this Fiber's context unless it's unique.
   if (context === nextContext) {
diff --git a/packages/react-reconciler/src/ReactFiberHydrationContext.new.js b/packages/react-reconciler/src/ReactFiberHydrationContext.new.js
index 141abb712c8f6..fd3f9b18a4921 100644
--- a/packages/react-reconciler/src/ReactFiberHydrationContext.new.js
+++ b/packages/react-reconciler/src/ReactFiberHydrationContext.new.js
@@ -444,7 +444,6 @@ function tryToClaimNextHydratableInstance(fiber: Fiber): void {
 
 function prepareToHydrateHostInstance(
   fiber: Fiber,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): boolean {
   if (!supportsHydration) {
@@ -460,7 +459,6 @@ function prepareToHydrateHostInstance(
     instance,
     fiber.type,
     fiber.memoizedProps,
-    rootContainerInstance,
     hostContext,
     fiber,
     shouldWarnIfMismatchDev,
diff --git a/packages/react-reconciler/src/ReactFiberHydrationContext.old.js b/packages/react-reconciler/src/ReactFiberHydrationContext.old.js
index 736463823d383..9ac9e4dc666b2 100644
--- a/packages/react-reconciler/src/ReactFiberHydrationContext.old.js
+++ b/packages/react-reconciler/src/ReactFiberHydrationContext.old.js
@@ -444,7 +444,6 @@ function tryToClaimNextHydratableInstance(fiber: Fiber): void {
 
 function prepareToHydrateHostInstance(
   fiber: Fiber,
-  rootContainerInstance: Container,
   hostContext: HostContext,
 ): boolean {
   if (!supportsHydration) {
@@ -460,7 +459,6 @@ function prepareToHydrateHostInstance(
     instance,
     fiber.type,
     fiber.memoizedProps,
-    rootContainerInstance,
     hostContext,
     fiber,
     shouldWarnIfMismatchDev,
diff --git a/packages/react-test-renderer/src/ReactTestHostConfig.js b/packages/react-test-renderer/src/ReactTestHostConfig.js
index 840912db30886..e049c3500c700 100644
--- a/packages/react-test-renderer/src/ReactTestHostConfig.js
+++ b/packages/react-test-renderer/src/ReactTestHostConfig.js
@@ -128,7 +128,6 @@ export function getRootHostContext(
 export function getChildHostContext(
   parentHostContext: HostContext,
   type: string,
-  rootContainerInstance: Container,
 ): HostContext {
   return NO_CONTEXT;
 }