> i.e. the lack of a tight feedback loop.

Lefthook helps a lot https://anttiharju.dev/a/1#pre-commit-hooks-are-useful

Thing is that people are not willing to invest in it due to bad experiences with various git hooks, but there are ways to have it be excellent

Yeah, I'm one of those people who seems to consistently have middling-to-bad experiences with Git hooks (and Git hook managers). I think the bigger issue is that even with consistent developer tooling between both developer machines and CI, you still have the issue where CI needs to do a lot more stuff that local machines just can't/won't do (like matrix builds).

Those things are fundamentally remote and kind of annoying to debug, but GitHub could invest a lot more in reducing the frustration involved in getting a fast remote cycle set up.