I have a second question that has arisen from this meta; how can I suggest that a comment may have problems without violating the "no discussion" rule?
By "no discussion" rule, I see this a lot "Comments are not for extended discussion" after comments have been deleted or moved to chat, so I guess there is a rule somewhere.
Example: Answer: "A, B, therefore C" Comment 1: "Good answer, very good, but I think Y isn't correct, it should be D, therefore E". What I want to say: "Good comment 1, very good, but I think D isn't correct, it should be F therefore G" or "it D is actually not correct because of H so B is actually right".
Why I want to say this: The original poster may not know this. Someone reading the answer might not know this. It doesn't make sense to me that someone criticizing an answer is themselves immune to criticism