There is no prohibition against using AI. I would say that stackers here value original thought, so there is a bias against it. I personally don't like it, and would not use it. I don't want to be completely close minded about it, though. There are a few stackers who obviously use AI in discussion as a sort of factual wikipedia layout of the issues. It's use is obvious, and the stacker doesn't try to pass it off as original. Some people may find that valuable.