The problem here is that toxicity and depth are tangential at best and probably completely unrelated in reality. Even in their demo, you don't really see any p

The problem here is that toxicity and depth are tangential at best and probably completely unrelated in reality. Even in their demo, you don't really see any particularly deep comments that touch at the root of the issue, rather than just graze the surface. So instead of a bunch of shallow toxic & benign comments you just end up with a bunch of shallow benign comments, with no tangible benefit going towards solving the issue. We shouldn't particularly care about keeping as many people in the discussion as possible. Instead, we need to incentivize as many people as possible to write deep, thoughtful comments, and then, and only then, perhaps filter the top comments by toxicity.