Proofreading is one place that AI can actually be a friend rather than a foe. If you give Claude your draft and tell it explicitly to call out misspellings and grammatical errors only, it does a really good job.
"I started the car and went for a drive on the highway. There were many other cats on the road but it was nevertheless agitating."
Given the correct prompt (that avoids changing your literary style altogether), AI can quickly suggest cats -> cars and agitating -> peaceful, since it's much better at contextualizing.
Proofreading is easily done with an editor. I think AI is much more useful for giving critic and advice on how you write your sentences. Setting the tone, refining the main idea, pointing out redundancies are some of the things that I find very useful.
Sometimes, but you have to be careful. IME Claude and (to my surprise) Grok 3 are really good at understanding your style and adapting their suggestions to match. ChatGPT, by contrast, tries to change everything into some kind of corporate drone.