There's a player queue functionality (which works kind of like a playlist) but I don't think it transfers across devices. But you can at least queue up a bunch of tracks on a device.
vividspecter
Audiobookshelf also supports podcasts (and ebooks, but I haven't tested that).
Morrowind. Although it's more like play a few hundred hours every five years for me.
0.82 is only two weeks old, so you would have needed nightly up until that point for most newer Garmin devices. I did uninstall Connect shortly after but I think you just have to make sure it's not running, as I know some use both apps.
Gadget bridge doesn’t really work for any “new” (i might be wrong here) devices.
Most newer Garmin devices should work since 0.82 (and earlier with nightly). It's not feature complete compared to using Gadget Connect but should be enough for most use cases, unless you really care about the social/awards aspect and some of the deeper metrics (although if you're handy with SQL you can handle that yourself).
Not being able to set an event date and have "daily suggested workouts" follow that is my only annoyance, although I've been happy just using the defaults for now.
They are planning to use KVM under the hood in the future. But who cares when we have qemu and libvirt.
You can actually play from the UI too, but it's not particularly nice to use (or intended to be used that way).
Another issue is that zwave isn't available in all countries (or it is but uses incompatible frequencies) so it's less useful outside the big markets.
That's the point of this standard, at least in theory. Same with the older but still common ZigBee standard.
Perplexica is one example. I also seem to remember there is some way to integrate it with SearxNG which is a self hosted meta search engine.
Maybe post an issue report on their github. The queue function does work on desktop at least (the web client), but I don't bother with playlists.