A simple enhancement would be to show (for instance with "...") if there are more levels, that is, if there's a n-3 or n+3, put a ... where it would be. That wo

A simple enhancement would be to show (for instance with "...") if there are more levels, that is, if there's a n-3 or n+3, put a ... where it would be. That would make it at least a little bit easier to navigate, by making it explicit when you're seeing an incomplete view of the thread.