Do you mean IT, or really tech in general?
For example, I don't see that many posts here about biotech.
And by quality, I don't just mean articles... there are some excellent critiques and well thought out discussions here. People will actually discuss things in a respectful manner even if they differ on opinion. (Relative to other sites)
I also really like that the user base, for the most part, requires statements to be backed up by facts and sources. That is something I don't see often enough on the web.
The best comments are sometimes tangential and sometimes may not get upvotes, but they offer a perspective that I had not considered.
What HN has going against it is the ever-present phenomenon of group think in many areas: the large crowd of Apple fans ready to defend anything no matter how fruity, the spectre of political correctness looming over anything related to, well, politics, the frequent killing-off of items which counter the current narrative on some subject, etc. While annoying these factors do not (yet) outweigh the positives.
I do visit HN through my own news aggregator, negating the popularity contest of articles rising and falling on the front page. This is, in my opinion, a good thing as it undoes some of the effects of the mentioned group think.
While I'm actually commenting for once I'd just like to say thanks to everyone here for all the wise words and pieces of knowledge you have passed on over all the times I've been visiting and hope to keep reading for a long time to come.
I'll also add that I'm reluctant to ever mention this place on other sites that I do participate in out of fear of bringing in people who are more likely to turn the place into something like a reddit comment section rather than a very easy read of straightforward information from people who are knowledgeable on what they are discussing, rather than a race to the bottom of puns and trolling.
I'm looking at you TheVerge/Recode/Reddit.
If they do, there's the 'About' field in the profile they can set with appropriate contact information.
In other news, I'm very fucked up that I allow myself to fall into these positive feedback loops that can diminish my quality of life.
Also, it happens to be the last major news-related website I know of with what I would call "good web design". That helps more than I'd care to admit.
It's apparently enough of a draw to have me lurking on this place nearly daily for almost 10(!!) years.
Edit: As to why here over other places - there's rarely any pun chains. Nothing puts me off a discussion more than pun chains
I'm mostly looking at headlines, reading a couple of comments to get the gist, and then reading articles only if there is interesting commentary.
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I can read opinions about issues I have thought about and cared about and get a new perspective.
I can get annoyed because someone wrote something wonderful and then a bunch of people nit pick it to death.
Also, the user base is usually data driven and fact centric, which is increasingly rare in the post-fact era.
+ Most comments made by people on the internet are ridiculous, emotional, uninformative rants. On HN, people seem to be smart enough to make informed points.
Big reason: to read the comments, not articles (most are trash and can be summarized in 4 sentences) surrounding interesting topics. I actually really like when socially controversial or political topics come up on HN, though I know some others don't, because the discourse level is so much higher than say, Reddit or NYT comments. I want to hear smart people comment on these things much more than I want to hear a magazine article pontificate/give a singular opinion/blame people.
I think there is huge value in this community, you guys debating, mentioning interesting stuff, inspiring or encouraging, etc, way more value than if I spent 30 mins a day devouring other "new content" sources.
I used to be addicted to reading the news, and for what? I think we gain next to nothing from it. It's trash, fear-mongering, clickbait and submarines. Try going without it completely for two months and you'll realize you missed absolutely nothing except the crisis in X and how celebrity Y hates Z now and you should too. It's all trash.
But good communities with commentary and solid rules? Real back and forth, articles with instant skepticism and poignant additions? Way more valuable and interesting. That's why I keep coming back.
Thanks for commenting, everyone.
 Sometimes if there is someone I think makes a lot of great contributions, I'll go to their comments page and read the last few comments they made, example: https://news.ycombinator.com/threads?id=gwern
Sadly almost all the users I really liked have stopped commenting.
 A good example of what I'm talking about is the Boston Review article that this article is complaining about: http://slatestarcodex.com/2017/10/09/in-favor-of-futurism-be... (I think the whole SSC article is worth reading)