If I'm understanding the thread correctly, I have a git alias to `git commit --amend --no-edit`, for exactly this workflow. When I'm hacking on something locally and want to just keep amending a commit. I only ever do this if it's HEAD though.

Yes, one way to think about jj in a sort of low-level way is that every jj command does the equivalent of that, every time.

(You can also set up watchman and have that happen on every file change...)