Well, I do like the idea of using the stock Shanling app without having to install anything from app stores. Especially since many apps Ive installed off apkpure either don't behave right or sound right on the M3X.
For example Hiby Music is unstable and crashes. Poweramp is really quiet and doesn't sound right if you turn it up. Many apps output at a fixed 386khz (or whatever) sample rate, which probably means wasting battery with upsampling.
The one exception to the rule I've found is musicolet. Once you change the decoder to "system decoder", everything works as it should.
I know many people like UAPP, but is there a way to install it without play store? It's not on apkpure, and there's no way I'm typing my google password into a device running Android 7!