In other words, you need to read a style manual or two, and you need to read and have opinions about other people's work. You must have taste. Otherwise, you can't really distinguish between good and bad advice. You'll anchor to the suggestions made by the LLM and it will turn your writing into LLMese. I guess that works - it sure gets clicks on HN - but it won't be your voice anymore.
There's still value in getting a second pair of eyes on what you write. But here's another cool trick that gives you a similar benefit: just let it stew. Go for a walk, grab a lunch. Re-read what you wrote. You'll be surprised.