As someone who spent a number of years mixing records professionally, I can definitely attest to the fact that even talented musicians are usually pretty terrib

As someone who spent a number of years mixing records professionally, I can definitely attest to the fact that even talented musicians are usually pretty terrible at mixing. It's a subtle art, and it takes a lot of experience/practice to do even remotely well. But I think the larger point is that most artists and labels would hate this. To a singer, having someone hear your soloed vocal track is like being seen naked. I think most artists view their records as being a single work of art. The song, arrangement, equipment, mixing, and mastering are all part of something bigger. Artists don't really want people to be able to break that apart. It's not meant to be experienced that way.