I don't really see anything miraculous here, other than "GitHub PR review UX sucks in comparison". Things like AI help and extra linters etc. are something that

I don't really see anything miraculous here, other than "GitHub PR review UX sucks in comparison". Things like AI help and extra linters etc. are something that a each project has to figure out on their own, and e.g. I maintain projects that use Nix dev shells to optimize and streamline the dev experience by a lot, even before things hits the change review stage. Github's PR review flow just breaks down for anything non-trivial. People have been complaining about it for years and suggesting a lot of relatively low hanging fruit improvements. The rest is about the culture of CRs some of which could benefit from built-in support, but some doesn't need it.