There are extraordinarily few cases where apps on iOS need to run in the background, beyond what can be accomplished via a periodic scheduled task or the system

There are extraordinarily few cases where apps on iOS need to run in the background, beyond what can be accomplished via a periodic scheduled task or the system eventing infrastructure. And the notion paraded here that every app is secretly doing it by pretending that it's playing audio is nonsense that has little correlation with reality. Android very recently -- at API level 26 -- added restrictions on background tasks for that platform (and it's much more involved than if you display a notification or not). Before that every app developer just spun up a background service for everything, and anyone who has done an iota of development on Android devices saw the tragedy of the commons that the platform became. So kudos to Google for cleaning it up a bit. Of course Samsung, Google and others just declare themselves immune from those restrictions and it's just a smaller problem, not a solved problem.