Auxio VS VinylMusicPlayer

Auxio, for instance, has a really well organized tracker

Btw, could you add the open to open feature requests on the GitHub? It seems to only track issues. Auxio has a pretty good system

Auxio (version 3.0.5): A simple, rational music player

It is already a pain in the ass to get Auxio installed and up to date. And that is an Open Source project that is available on F-Droid.

That said, some apps do use Material Design 3: Sync, Simple File Manager, Auxio Tap, Tap

Auxio is a solid choice.

I use Auxio, it's foss, it uses Material Design 3 and the Dev is a nice person.

Auxio music player. Free and open-source

Auxio (version 3.0.3): A simple, rational music player

You should try Vinyl Music Player from GitHub. Works best for offline files.

try vinyl music player, way better https://github.com/VinylMusicPlayer/VinylMusicPlayer

Another is Vinyl, which doesn't support Material You, but have a decent support of .wav music. Some users have some troubles, but Vinyl works on my phone. But, again, it doesn't support Material You.

Vinyl: F-droid || GitHub

Tbh i just use vinly as alternative player, i think no.3 which you mentioned got fixed in 2021 release and new bugs also got fixed in this release, i would suggest you to try vinyl as it recently recieved update and currently active, you can always fall back to phonograph plus if you don't like it :) Here is release changelogs

Vinyl Music Player (version 1.4.0): Light and slick material design music player

Vinyl Music Player may be what you are looking for.