Its probably one of these things where its just the norm and nobody cared enough to change it because it brings in money.
Plus the CD in it is the only thing that makes it still about music instead of just a bunch of collectibles. the CD itself is essentially just a physical representation and reminder of what your paying for.
Essentially it can be seen as a receipt. I like to keep my concert tickets even though I paid for the performance and not an actual piece of paper. Which reminds me too, online concerts sell you "physical tickets"....lol I think it's the same concept.
I guess I need a bigger house then if I wanted to buy CD’s😂.