Whoa whoa whoa, first of all, when I say "tampered with" I am most certainly not referring to EQ or reverb effects and such. That's just part of mixing/ mastering. Yes technically you could call that "tampering", but I'm pretty sure no one here is referring to that (right?). I only mean re-recording or tuning any section of vocals. Sorry for the misunderstanding, if there is one!
Point #2, I'm actually really surprised people would disagree with me on this!
Firstly, it has absolutely nothing to do with expectations. If someone makes a peanut butter and jelly sandwich, adds ketchup into it, and serves it to you, it does not taste terrible because you didn't expect the ketchup. It tastes terrible because ketchup goes terrible in peanut butter and jelly.
Secondly, it's preposterous to say that you have total control over whether something you're experiencing is pleasurable or not. The only thing you have control over is your preconceived notions and your attitude. Beyond that, it's left up to the traits of the experience itself and your natural opinions of those traits. Whether you are served that sandwich hoping for it to be delicious, really wanting to like it, or expecting it to be terrible, either way it's gonna suck.
Also, if you say "I believe DT already have their own performance integrity" you don't really understand the meaning of the word, because integrity is entirely objective (The house will either fall over or it won't). Maybe what you mean to say is that what DT consider integrated is in disagreement with what I would consider integrated. In that case, then we'd have a discussion because we could debate which definition is actually true.