One problem is that the uncertainty around hackers can lead to a toxic accusatory culture. I have seen multiple games where the high level (but below pro) gets bogged down in accusations of hacking; is someone genuinly more skilled or using aimbot (one is more comforting than the other). People giving up on a match because of some percieved inconsistency in the movement of someone on the other team etc. Or cases where someone is genuinly hacking but others not believing it "you're just mad" because of all the false positives.