I guess my reply to you would be under 'meta' because my questions to you are:

What do you mean by: 'more room for nasty rules lawyering("This is not Hacker News")'?

I like your idea; how would I choose between 'information' and 'related'- or 'opinion' and 'related'? Would 'factual' and 'insightful' be more useful as labels?