It’s simple common sense..the more clicks it takes to get to your music, the harder it will be for people to hear it, and without people hearing it, there’s absolutely no chance at making a sale.
The biggest problem here really lies in the way that the internet is structured. The web is a very visual thing in it’s nature. Photos or Artwork can be posted up almost anywhere, and once seen, the damage has been done. With music this is not the case. People mostly have to rely on links to attract people to their music. There’s nothing to distinguish 1 link from any other link. There’s not even a special kind of link for music. It sounds weird, but the web is just not set up to handle music yet.