Yea, the whole "looks old = bad" meme rears its head again. Some of the most usable web sites in existence like Craigslist and McMaster-Carr look "old" but they do what you need them to do and do it cross-platform/cross-browser.
Indeed. Hacker news is about as responsive as the native site.
Reddit on the other hand went to being completely unusable. So much so, that I don't understand who and what motivates it to be the way it is. It's having on due to "old.reddit", but that too is a pain to use on mobile.