> This is one of the things that web-based forums have yet to get right. Email (and NNTP news) clients from 20 or 30 years ago are far superior in this respect, because they can intelligently deal with threading and folding.

If you buy Reddit gold which makes Reddit to highlight posts that are new since you last time viewed the discussion, then Reddit becomes almost as good as NNTP clients were 20 years ago.