I just want it to recognize that I sort my music into folders and show the folder hierarchy. Instead, in my last car, it would flatten the entire structure and then sort by filename. To top off the shitshow, it would also only show up to 99 files, and scrolling through the list was painful. Each tap on the scroll button would only move one line, not one page, so if I wanted to play the 80th song, I'd have to tap to scroll 80 times.
seriously though, the USB audio player is a dumpster fire. They completely redid it with the last update -- and it got worse, not better.
some random examples off the top of my head: - switch to another input source and you lose your audiobook position - sorting is completely utterly broken - audiobook has no skip-back-a-little function - soooo many bugs
The only nice things I could say is that it mounts linux filesystems plus it plays FLAC and Apple lossless directly.
Eventually the usb port just stopped working so I use VLC on the phone and stream to the car via bluetooth.