There isn't much to improve in HN UI except maybe two things: megathreads with 100s of comments and recent popular posts that's disappeared in the HN archive. I

There isn't much to improve in HN UI except maybe two things: megathreads with 100s of comments and recent popular posts that's disappeared in the HN archive. In megathreads there is no way to see at a glance what comments are new. And in HN archive there is no way to show only posts with more than 100 upvotes.