You can verify from my comment history that I love talking shit about Mr Dye as much as the next guy, but no. Car Play limitations are certainly not an Alan Dye decision. Everything in CarPlay is stripped down cause it's not safe to be navigating menus and doing deep interactions while driving.

The passenger can use the phone if you want to be able to scroll through an artist's catalog, rearrange playlists, etc. CarPlay's UI is a quick way to access your current library.

This interaction works in Apple Music on the phone, but not in CarPlay.