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).
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).