> well-researched essay comments are exactly what's exhibited on HN

For technical subjects. If you want a good conversation about politics, you should go where those experts are.

> yet miraculously-synchronised agenda.

Hey look, a conspiracy theory! As for highly-polarised, emotional and often baseless, you'll find that wherever politics are discussed from forums to the dinner table. There's no point in adding tools so people can create their own bubbles inside of off-topic discussions.