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.
formalized highschool and college debate is pretty much this
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The jargon in the community for speaking really fast to win] is “spreading” and it was a dominant strategy by the late 1990s. Serious debaters expect to learn to read, listen, and talk that fast. There is widespread acknowledgement that it is tactical, and many sniff “against the purpose of debate” (while speaking at 200+ words per minute), but debate is a sport like football is a sport and if you want to play football without running or losing to people better at running than you, you may be selecting for a high friction lifestyle.
(There are several debate communities with some overlap, given that there are several styles of debate with different rulesets, organizations, and microcultures about performance. At least when I was doing it in 2000-2004, spreading was hegemonic in Policy debate and less effective (and beatable) in Parliamentary debate.)