For me the real issue with no CD player is sound quality and I'm a music guy.
Yes i have an iphone and I have hundreds of albums ripped to 2 large USB flash drives, but that compresses the music and Fidelity is loss vs a CD. But I realize 99% of people could care less about compressed music using both bluetooth and USB drives. And i do at times also, but can't compare vs. a good quality CD recording
That is the exact reason I prefer non-compressed original wma files on usb or on a phone that accepts them. Much better audio quality by far than mp3. Oh, and bluetooth drops audio quality as well...must have direct connection.