Different people will have different ideas of where on the 4chan - colloquium continuum a discussion should be, so here's a feature suggestion: post authors should be able to set a karma requirement to comment to the post. Beginner-level posts would draw questions about the basics, and other posts could have a karma requirement high enough to filter them out.

There could even be a karma requirement to see certain posts, for hiding Beisutsukai secrets from the general public.