>This is certainly a special case (and also somewhat of an endangered species.)

I'm not so sure about that. This site isn't that different from stuff like reddit or tumblr at it's heart, even if the level of discussion/quality of posts is higher. If you distilled these types of sites even further, it's really not all that different from social media like facebook or instagram. The only difference is the type of content shared and the fact that facebook and instagram are usually used with you being "yourself" rather than just a username. Then again, enough people on hackernews link their profiles to their own personal websites/linkedins/etc. that even that distinction isn't so sharp.