Something that doesn't get talked about as much is the differences between how manufacturers customize their OS. It has been talked about a fair bit on HN (https://dontkillmyapp.com/), but it really is a huge problem.

I can be listening to music on my phone and One+ will just kill Pandora, or Spotify. I have to manually "lock" music apps and workout apps in One+'s task switching UI to keep them from being randomly killed while in use.

Hilariously enough I have one game on my phone that will always run in the background and never be killed, sucking down a lot power. Somehow even when not in the foreground it consumes massive CPU. I don't think it is even malicious, just oddly programmed. I wish my music apps could pull off the same trick though!