It's really the most bizarre thing. They built a site with affordances for discussion (although the mods might call them attractive nuisances). It looks every bit like a discussion site.

The users clearly want to have discussions, and not just factual Q&A.

And yet when you use these affordances to engage with like minded people, you get shut down. It's become a game with myself when I go to an SO page to guess whether it's been shut down, and the result is often a derisive mental "yup."

And for the record, I prefer a rich discussion to an inferior imitation of wikipedia.