> I'd be pissed if I put in a lot of effort revising my contributions to a project, only to be told at the end that "I like my version better, so go away!"

Frankly, I think that's a non-trivial problem to solve: how to get the assumedly better fix while not ruffling the feathers of the more junior contributor so not to discourage on-ramping.

I guess the best way to do it would be to have a co-authored-by tag, or something akin.