Refine polish section impact, define milestones

src/vision/roadmap/polish.md

@@ -2,7 +2,40 @@
 
 ## Impact
 
+* Users can predict and understand why the compiler raises error messages. Errors are aligned with an experienced user's intuition about how Rust works.
+* Error messages identify common misconceptions, suggest solutions, and are generally on par with sync Rust.
+  * Errors not only show that there is a problem, they help the user to fix it and to learn more about Rust (possibly directing the user to other documentation).
+  * The compiler may suggest crates from the ecosystem to help solve problems when appropriate.
 * Lints guide the user away from common errors and help them both to get started with async Rust and to maintain async Rust programs over time.
-* Errors not only show that there is a problem, they help the user to fix it and to learn more about Rust (possibly directing the user to other documentation).
-* The generated code from the compiler is high quality and performant.
-* Integration with low-level tooling and the like is high-quality.
+* Rust's async implementation is high quality and reflects an attention to detail.
+  * No internal compiler errors
+  * Compiler analysis and code generation passes are precise and not unnecessarily conservative.
+  * Integration with low-level tooling and the like is high-quality.
+  * The generated code from the compiler is high quality and performant.
+
+## Milestones
+
+| Milestone                                  | State | Key participants |
+| ---                                        | ---   | ---              |
+| Precise generator captures                 | 🦀    | [eholk]          |
+| ↳ Prototyped                               | 🦀    | [eholk]          |
+| ↳ Documented in Rust Reference             | 🦀    | [eholk]          |
+| ↳ [Lang team] initiative proposal          | 💤    | [eholk]          |
+| ↳ [Lang team] signoff                      | 💤    | [Lang team]      |
+| ↳ Stabilized                               | 💤    | [eholk]          |
+| Lint: [Large copies], large generators     | 💤    | |
+| ↳ [Lang team] initiative proposal          | 💤    | |
+| ↳ Implementated                            | 💤    | |
+| Lint: [Must not suspend]                   | 💤    | |
+| ↳ Implemented the [RFC]                    | 💤    | |
+| Lint: [Blocking in async context]          | 💤    | |
+| ↳ RFC proposed and accepted                | 💤    | |
+| ↳ Implementated                            | 💤    | |
+
+
+[eholk]: https://github.com/eholk/
+[Lang team]: https://www.rust-lang.org/governance/teams/lang
+[Blocking in async context]: ./polish/lint_blocking_fns.md
+[Large copies]: ./polish/lint_large_copies.md
+[Must not suspend]: ./polish/lint_must_not_suspend.md
+[RFC]: https://rust-lang.github.io/rfcs/3014-must-not-suspend-lint.html