I think it's hard to generalize because people have different approaches to writing, but to me, there's a marked difference between iteratively polishing my own text and editing for someone else (and that includes LLM output produced by my own prompts).

In the second case, these sentences were never a "voice in your head", and you never invested any effort into shaping them, so it feels more like janitorial work / drive-by nitpicking than craftsmanship.