Most of the cars that would be considered "the best" are still hand-made, at least to a large degree.
The difference though is that a car is a physical object produced by a persons talent. A vocal track is (in spirit at least) something produced directly, or a direct output of the vocalist. Part of the mystique is supposed to be the fact that not everyone can carry a perfect tune. Except than when you apply too much technology post-processing, you eliminate the exclusivity (and garbage up the track at the same time).
This reminds me of the time I attended a clinic taught by Marty Friedman (ex Megadeth guitarist). The audience had a few "purists" who seemed miffed that he'd strayed from his roots to perform pop-music in Japan. After being asked about the merits of his new endeavors he simply responded (paraphrasing) "Who wants filet mignon at every meal? Sometimes I just want a cheeseburger from a fast food joint".
I don't think it's a bad thing. I think the result is generally cliche crap, but some people like it, so whatever floats your boat.
I just think it's strange to apply inconsistent standards to the same genre. It's ok that the music is precision-engineered on a computer, but not the vocals? Have it one way or the other.
