If you encourage the procedural, gamified and contrarianist version that "devil's advocate" often becomes, and don't pay attention to preparation, substance and framework (like these platforms), you don't get the critical thinking you want in the world but "let's make shit up."
Well there is a lot of that, but a lot of people feel, or are encouraged to feel, that the game they just engaged in is "critical thinking" or debate, rather than what you just said. So yeah, not displacing the same space, but maybe the "feel" for that desire.