diff --git a/packages/react-native/ReactCommon/react/runtime/ReactInstance.cpp b/packages/react-native/ReactCommon/react/runtime/ReactInstance.cpp
index 0b8128c586f4b0..380199cc1ad3ff 100644
--- a/packages/react-native/ReactCommon/react/runtime/ReactInstance.cpp
+++ b/packages/react-native/ReactCommon/react/runtime/ReactInstance.cpp
@@ -148,8 +148,8 @@ RuntimeExecutor ReactInstance::getUnbufferedRuntimeExecutor() noexcept {
 
 // This BufferedRuntimeExecutor ensures that the main JS bundle finished
 // execution before any JS queued into it from C++ are executed. Use
-// getBufferedRuntimeExecutor() instead if you do not need the main JS bundle to
-// have finished. e.g. setting global variables into JS runtime.
+// getUnbufferedRuntimeExecutor() instead if you do not need the main JS bundle
+// to have finished. e.g. setting global variables into JS runtime.
 RuntimeExecutor ReactInstance::getBufferedRuntimeExecutor() noexcept {
   return [weakBufferedRuntimeExecutor_ =
               std::weak_ptr<BufferedRuntimeExecutor>(bufferedRuntimeExecutor_)](
diff --git a/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTHost.mm b/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTHost.mm
index 9fdac6566a5bed..d8c472dc39af40 100644
--- a/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTHost.mm
+++ b/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTHost.mm
@@ -104,11 +104,6 @@ @implementation RCTHost {
 
   NSDictionary *_launchOptions;
 
-  // All the surfaces that need to be started after main bundle execution
-  NSMutableArray<RCTFabricSurface *> *_surfaceStartBuffer;
-  std::mutex _surfaceStartBufferMutex;
-
-  RCTInstanceInitialBundleLoadCompletionBlock _onInitialBundleLoad;
   std::vector<__weak RCTFabricSurface *> _attachedSurfaces;
 
   RCTModuleRegistry *_moduleRegistry;
@@ -152,7 +147,6 @@ - (instancetype)initWithBundleURLProvider:(RCTHostBundleURLProvider)provider
   if (self = [super init]) {
     _hostDelegate = hostDelegate;
     _turboModuleManagerDelegate = turboModuleManagerDelegate;
-    _surfaceStartBuffer = [NSMutableArray new];
     _bundleManager = [RCTBundleManager new];
     _moduleRegistry = [RCTModuleRegistry new];
     _jsEngineProvider = [jsEngineProvider copy];
@@ -185,33 +179,6 @@ - (instancetype)initWithBundleURLProvider:(RCTHostBundleURLProvider)provider
                                        andSetter:bundleURLSetter
                                 andDefaultGetter:defaultBundleURLGetter];
 
-    /**
-     * TODO (T108401473) Remove _onInitialBundleLoad, because it was initially
-     * introduced to start surfaces after the main JSBundle was fully executed.
-     * It is no longer needed because Fabric now dispatches all native-to-JS calls
-     * onto the JS thread, including JS calls to start Fabric surfaces.
-     * JS calls should be dispatched using the BufferedRuntimeExecutor, which can buffer
-     * JS calls before the main JSBundle finishes execution, and execute them after.
-     */
-    _onInitialBundleLoad = ^{
-      RCTHost *strongSelf = weakSelf;
-      if (!strongSelf) {
-        return;
-      }
-
-      NSArray<RCTFabricSurface *> *unstartedSurfaces = @[];
-
-      {
-        std::lock_guard<std::mutex> guard{strongSelf->_surfaceStartBufferMutex};
-        unstartedSurfaces = [NSArray arrayWithArray:strongSelf->_surfaceStartBuffer];
-        strongSelf->_surfaceStartBuffer = nil;
-      }
-
-      for (RCTFabricSurface *surface in unstartedSurfaces) {
-        [surface start];
-      }
-    };
-
     // Listen to reload commands
     dispatch_async(dispatch_get_main_queue(), ^{
       RCTRegisterReloadCommandListener(self);
@@ -261,7 +228,7 @@ - (void)start
                                    jsRuntimeFactory:[self _provideJSEngine]
                                       bundleManager:_bundleManager
                          turboModuleManagerDelegate:_turboModuleManagerDelegate
-                                onInitialBundleLoad:_onInitialBundleLoad
+                                onInitialBundleLoad:nil
                                      moduleRegistry:_moduleRegistry
                               parentInspectorTarget:_inspectorTarget.get()
                                       launchOptions:_launchOptions];
@@ -278,15 +245,7 @@ - (RCTFabricSurface *)createSurfaceWithModuleName:(NSString *)moduleName
   surface.surfaceHandler.setDisplayMode(displayMode);
   [self _attachSurface:surface];
 
-  {
-    std::lock_guard<std::mutex> guard{_surfaceStartBufferMutex};
-    if (_surfaceStartBuffer) {
-      [_surfaceStartBuffer addObject:surface];
-      return surface;
-    }
-  }
-
-  [surface start];
+  [_instance callFunctionOnBufferedRumtimeExecutor:[surface](facebook::jsi::Runtime &_) { [surface start]; }];
   return surface;
 }
 
@@ -320,17 +279,11 @@ - (void)didReceiveReloadCommand
     [self _setBundleURL:_bundleURLProvider()];
   }
 
-  // Ensure all attached surfaces are restarted after reload
-  {
-    std::lock_guard<std::mutex> guard{_surfaceStartBufferMutex};
-    _surfaceStartBuffer = [NSMutableArray arrayWithArray:[self _getAttachedSurfaces]];
-  }
-
   _instance = [[RCTInstance alloc] initWithDelegate:self
                                    jsRuntimeFactory:[self _provideJSEngine]
                                       bundleManager:_bundleManager
                          turboModuleManagerDelegate:_turboModuleManagerDelegate
-                                onInitialBundleLoad:_onInitialBundleLoad
+                                onInitialBundleLoad:nil
                                      moduleRegistry:_moduleRegistry
                               parentInspectorTarget:_inspectorTarget.get()
                                       launchOptions:_launchOptions];
@@ -338,6 +291,7 @@ - (void)didReceiveReloadCommand
 
   for (RCTFabricSurface *surface in [self _getAttachedSurfaces]) {
     [surface resetWithSurfacePresenter:self.surfacePresenter];
+    [_instance callFunctionOnBufferedRumtimeExecutor:[surface](facebook::jsi::Runtime &_) { [surface start]; }];
   }
 }
 
diff --git a/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.h b/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.h
index 4f94b5700b5154..2694e58bc46ec3 100644
--- a/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.h
+++ b/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.h
@@ -65,6 +65,7 @@ typedef void (^_Null_unspecified RCTInstanceInitialBundleLoadCompletionBlock)();
                    launchOptions:(nullable NSDictionary *)launchOptions;
 
 - (void)callFunctionOnJSModule:(NSString *)moduleName method:(NSString *)method args:(NSArray *)args;
+- (void)callFunctionOnBufferedRumtimeExecutor:(std::function<void(facebook::jsi::Runtime &runtime)> &&)executor;
 
 - (void)registerSegmentWithId:(NSNumber *)segmentId path:(NSString *)path;
 
diff --git a/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.mm b/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.mm
index ddeb1e9eff9437..cb78fb540d2ba8 100644
--- a/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.mm
+++ b/packages/react-native/ReactCommon/react/runtime/platform/ios/ReactCommon/RCTInstance.mm
@@ -393,6 +393,15 @@ - (void)_attachBridgelessAPIsToModule:(id<RCTTurboModule>)module
   }
 }
 
+- (void)callFunctionOnBufferedRumtimeExecutor:(std::function<void(facebook::jsi::Runtime &)> &&)executor
+{
+  self->_reactInstance->getBufferedRuntimeExecutor()([=](jsi::Runtime &runtime) {
+    if (executor) {
+      executor(runtime);
+    }
+  });
+}
+
 - (void)handleBundleLoadingError:(NSError *)error
 {
   if (!_valid) {