I have just open a question about More on syntactic vs semantic classes, and UP vs NP. In the comments, @Tsuyoshi and I were discussing whether my interpretation about a related result to the problems is correct or not. As he said, this discussion is not directly related to the main questions, and by his word "this is kind of off topic here", and I agree.
Since the discussion is all about related results and not about the site, I see no reasons to put the discussions here in meta. But staying in the same question may be improper too. So what should I do if I would like to continue the discussion? Should I open a new topic just about interpreting the related result? Is that off-topic in TCS SE? (Since SE sites discourage discussions.)