Aren't down votes on this forum restricted to 500+ karma? And how would those compare to flagging? I'd hate for people under 500 karma to think they need to flag a post in order to have it get any attention by moderation. And, with your idea that LLMs help folks write, wouldn't that make the community worse for them?
And what about users like this, whose comment are very much entirely LLM generated and possibly even a bot? https://news.ycombinator.com/threads?id=BelVisgarra
I should clarify — I disagree with disallowing any comments that used LLMs in the writing. I think comments should be judged on their quality, not on how they were written.
I might agree (don't know) with the idea of limiting new accounts more heavily.