"you can't tell if a player is cheating or not, does it matter that they are"

This is basically effectively where KLA has gotten to. There are still plenty of cheaters, people just don't realize.

I think it does matter in a strictly moral sense, and if people were more aware of how bad the problem is, they would likely be outraged. Alas, since they can't see it, they are not aware of it, so there is no outrage and the games companies are satisfied.