There does seem to be a need for better methods of quoting. I've seen people quote text with code blocks that look absolutely abysmal on mobile.
Most people seem to end up doing it 4chan style, sans the highlighting 4chan provides.
Other than that though, yea- HN isn't in dire need of changes. There are alternative frontends if you want them, though. I like the chronological fixation of http://hckrnews.com