TBH id have more fun going back and playing vanilla tf2 then playing with quick fix, the other weapon unbans aren't as bad as the quick fix. But the quick fix is straight up broken it needs more re work before i want see it in a league. I have mention this before in a earlier post, its similar to the booty situation, if one teams runs the quick fix then the other team needs to do the same(in lower level gameplay, like open). The reason i say that is when a med can just fly to mid with your demo, the mid is pretty much over if the other teams medic is running uber. As a demoman main, i have never felt so frustrate in my entire life, like i do so much damage but it actually means nothing(for example doing 400 damage to someone and they just live and are fully buffed, with no consequence) ,so now your damage stats mean nothing(not saying that it should matter a whole lot, but it should matter somewhat.)These are just my thoughts, of scrimming against it.
If you are interested in looking at stats i guess idk
I think for the sake of having fun in this dying game, just keep the quick fix banned unless something major happens to it.