Using it as just a news source seems really valid.
And it feels different from other social media platforms because of the focus on full discussions. But surely this still counts as social media?
Genuinely asking because I see you made your account just to post this comment - why did you do that? It's not a bad thing (I'm here too), I'm just curious why you felt it was important to do?
But, without a social graph, I wouldn't call it a social network, so it does not suffer a lot of the problems social networks have (e.g. echo chambers, ostracizing members, showing off, influencers, and many others).
Social media has problems, social networks have problems, and social media which leverages a social graph has a whole different class of problems. Ironically, the relative primitiveness of HN protects it from at least some of the worst elements of the internet.