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.
Not OP, but it's not smart/educated that I like to have these conversations with. It's humble, polite, open minded people. For the most part these two axes are usually orthogonal and independent. The one correlation I've found is that if one's lack of education is approached in a way that contributes to them feeling insecure, then they move into survival mode, become defensive, and thus less open minded.