No Tenson... there is a minor difference in your example. The distortion from RFI is exactly the same (common mode) in both lines and when you take the signal difference betweeen them it will obviously cancel out. In this case you are not taking some kind of distortion and adding another kind of distortion to compensate for the first.

A cleaver example though...

As for accuracy doesn't necessarily sound good, you are right. But that doesn't invalidate the major goal, which is to have your voice reproduced as faithful as it can be. The vast majority of the records does sound better with better accuracy because you are extracting every bit of life in it.

Sounding nicer means you'll necessarilly loose the live sensation...

I don't read (nor I can) while I'm listening my true hi-fi, like it would happen in a live concert.