kosif valve were to host a tournament it wouldn't be the tf2 that you want to see. them adopting our abstraction of the game, i.e. class limits, whitelist etc., would be them basically admitting that their game is broken.
and yet even blizzard, the kings of pretending that a casual game is competitive, put class limits into their game. They were so careful to design their game so that the casual experience is as similar as possible to the competitive one, and yet they threw that tenet out in regards to class limits because they realised how damaging class stacking is in a competitive game.
Making the game better to watch and play should be the goal, and class limits and weapon bans currently do that. Ideally soon we won't need to ban weapons anymore but that's dependent on valve as well.