It's an interesting idea for sure, but I'm not sure how or if such a thing can exist. Moderation becomes a headache, and well, a lot of truly brilliant people I've met in life have zero interest in debating it. How do you keep out the YT commenters, Fox News or r/politics commenters, etc?
It would be interesting if HN had some bucket like /offtopic, for things that are flamebaity and removed from the main view, but I fear it would attract the aforementioned people who only ever troll there, and dang probably having zero interest in mod'ing it.
Since then, I've been seriously pondering how a community would feel like that would simply enforce humble, fact-based discussion by technical means. FWIW, I'd be curious to try it out.
I've found out the hard way that social problems are usually a really terrible fit to technical solutions, but I'm curious anyway.
This idea might be a great one to try to go together with that idea.