Earlier quoted context omitted.
The whole site needs rewriting and modernizing. Considering the audience, it's kind of shocking how stale it is.
I have a sneaking suspicion that maybe, just maybe, the looks of HN have helped protect the community against trolls. Everybody knows internet commenting is crude, rude and awful more often than not. In my opinion HN is a glorious example of an online community done right and I'm not sure we should change the site. But who knows, maybe it will even be better if it gets a little make-over.
Email replies are covered by HN Notify, which, while hacky, does the job. It would be nice to have a simple Reddit-style red envelope, though, rather than clicking my username, then 'Comments' to see if I've had replies.
Of course, there are people who will say, "How much effort is it to click the back button?" but the irony is that these are exactly the kind of bad UX choices that the HN community would criticize any "Show HN" for.
I find the dissuasion away from multiple levels of replies as though in-depth discussion is a bad thing to be bewildering. Comments like "Replying here because I can't reply deeper" shouldn't need to exist. Apparently it's to prevent arguments, but collapsible comments would hide away anything you don't want to follow further.