So many of these design trends you see are due to the "tyranny of the marginal user" (there was a fantastic post on HN about this a while ago). That is, once you get your core users, design changes get made to try to appeal to people who apparently "only have one working thumb" and all they're capable of doing is scrolling.
I get that HN might not be the most "user-friendly" site for brand new users, but so what? It takes a couple mins to read the site guidelines and figure out what's going on. There is no need to make the site less appealing to frequent users in an attempt to lower the already pretty low bar for new users.