Just a few days ago, there was this trailer on the front page, for a movie with mecha robots fighting godzillas or something, and it was just... terrible. For whatever reason, maybe to get some reassurance, I read the comments. 3000 people falling over themselves wanking over it. In disbelief I loaded more and more comments just to try and find at least one negative comment. What are these people, 17 year-olds? And then it hit me. They ARE 17 year-olds.
I get it, subreddits blah blah blah, but there's no point. Sticking to subreddits destroys the sense of community which is so important for online forums. When the front page is dominated by teenagers, how long do you think others will stick to the site? Not to mention, having to log in to see your own specialized front page is a hassle when you're on many devices and don't really care enough to have an active account. Subreddit discovery is also too difficult, and then there's the whole filter bubble going on. I'd prefer a general purpose forum with higher quality people than hiding in some corner of a site dominated by teenagers.
More and more, HN is filling that purpose for me, with a healthy balance of tech and non-tech. I sort of wish there was a separation between "tech" and "general" though, so that the general discussions could expand without affecting the tech side of things.