I think the issue with Rails, as a long time developer in that ecosystem, is that much of the default assumptions are a) not common (not so far off-piste that a human can't get used to them, but outside the center of the bell curve), and b) not explicit. So it's very common to do things like install a plugin that has across-the-repo effects but that is only documented in e.g. the config directory and the bundle. Unlike, say, NPM, when you install a new package where you explicitly have to e.g. import it everywhere you want to use it.

As time has gone on Rails has gotten better about this, but it still means that "your rails" and "my rails" are different enough that AI could easily get confused.

As you say, the other aspect is the intense dynamism which works against AI, which again prefers to have everything explicit and reasonable about from the text.

So I ended up going back to Javascript after a brief 12 year digression into Ruby. I still love Ruby but it's just not the right language for the current environment and team structures - typescript is "worse is better" in the right ways that it's a much better choice for both frontend/backend being the same and better type systems.

Types are great. No nulls are great. Exhaustive switches are great. Derive macros and Serde are great. Detailed errors are great.

However Rust has one serious problem, BUILDS. It’s slow and it takes up a ton of space and memory. You will be working around this on any sizeable codebase. Using cargo check to ration your compiles, a dedicated build box, etc. Now imagine you're using it for a web application with compiled maud templates... you're potentially waiting minutes to see your changes.

If we accept that over half of the people building with rust are using agents (I'm sure this is much higher in reality), then you should also accept that there is a ton of time and resources spent on building / compiling. Optimizing this should probably be a top priority. They need someone who will be fanatical about shaving time and memory use from the build process.

I still review PRs, but rarely suggest changes. The most meaningful reviews come from our review bots. I mostly review broad architectural decisions as a way to keep abreast of changes in the codebase. There's a cohort of engineers I work with who I would be perfectly okay with letting the clankers review, approve, and merge their PRs. But there's a larger cohort of engineers who need what I would call a directional code review.

Agile is dead. It presumed writing the code was the slowest part of the cycle. Now it makes more sense to only start writing code when the requirements are known as the code is quick and low cost to change if/when the requirements change later.