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Your thesis is right but in this example this is instead one of the “Alan Dye” hidden UI instances where the functionality is intentionally hidden (I presume in the name of aesthetic minimalism rather than safety, because this is what Apple design does outside CarPlay too). At least in Apple Music, I think you tap on the artist name in the now playing screen, and I think you get a menu to go to album or artist from there. If I’m wrong, somebody correct me and I’ll delete, I’m away from my car today and can’t verify.
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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.

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