Reddit style up/downvote system is a great “homogenizer” of opinions. Applied correctly, it only leaves the most desirable opinions to survive. It also allows discussions to be steered without commenting.

Together it allows majority vote to simply take control of a comment page, and first rule of online voting is it’s always manipulated.

You know where that goes. You will end up with a self driving system that represents the richest guy there, with little control input necessary, into the walls.