I do not think the community will against the use of AI to fix English grammar, that should be acceptable. I even see it as more stress which is the minor reason that I can not use AI but the major reason being that I prefer to communicate with people naturally instead of using AI.
The problem is, when you ask AI to find the grammatical errors and fix them, it actually changes the wording and rewrites it for you. It provides you with a similar response if your prompt is like "write a reply to this post,". Your original content does not remain original anymore. According to ChatGPT, that is a polished version of your text.
But I tried a command "find grammatical errors and fix them without changing any words," and it worked fine. It just changes the punctuation and the typos. I couldn't even notice what changes it made. But I don't think I need it since I am using Grammarly already, which fixes typos automatically.