Auxio VS Gotify

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

I use apprise with Gotify

You can self-host a notification service using https://gotify.net/ for example, but you may need to ask the user to disable battery usage restrictions if you don't want the OS to kill the background process.

If you do not need the state tracking, but instead need something that can deliver push notifications to you, check out ntfy and gotify

Gotify (version 2.5.1): A client for receiving push notifications

I've found Gotify to work well for that

Just FYI - there's also shoutrrr and gotify with similar functionality. I've tried them, they're very good, but not fitting my (very humble) needs.