Thanks for the thoughtful reply. I can see how in fact jj could be considered an adjacent tool to Magit. Similarly Magit does not "dumb down" git like other git GUIs. As the Magit manual puts it, it's actually a fully fledged git porcelain. I guess jj is the same.

So I think I would revise my comment above and say I don't need jj because I've already got a toolkit that does a similar thing. I haven't raw dogged the git CLI in a decade.

However if I ever run into a problem like yours and my tools aren't cutting it I'll definitely keep jj in mind so thanks for showing me!