Isn't that the way with almost every tech introduced into phones? "Track your phone while off (for arbitrary unit of time)" = you're tracked by any Bluetooth beacon networks whether you want to or not. Also, "you're now part of a beacon network whether you want to or not."

Any 911/safety feature is just a reach for more tracking/stalking.

You get to contribute to traffic and wifi mapping so the company gets free telemetry they can use for whatever they please at the expense of your battery.

We'll introduce notifications and then not give the user enough control, so notifications can become malicious nags to get you to look at your phone as often as possible.

We'll introduce app stores that become gamified by the app devs, that push updates weekly or more frequently. The changes? Nothing, the dev just wants to reset the ranking of reviews and get the user to notice their app again for more user engagement, meanwhile, burning out your flash with every pointless update.

Oh, shoot, people are using phones too much, we'll introduce "night filters" that only partially filter out blue light, and then let you feel ok about using your phone all night instead of sleeping.

Reckless transmission of telemetry from every app, which often have some blanket permissions to reach into your phone and extrapolate what other apps are there, characteristics of your phone to fingerprint. If you've ever used an app tracker blocker like 1Blocker on iOS or NextDNS or DuckDuckGo App Tracking Protection on Android, you'll see some apps are spatic about gathering and transmitting telemetry. (Worse, some just start firing telemetry attempts at insane levels, like thousands an hour, if they can't connect to the Internet, further depleting your battery.)

If you ever spin up an OS like Graphene that has all this telemetry junk removed, you'll be surprised to find out that your phone's battery can last days. That's an actual useful powerful feature to have, runtime. And instead of having switches like in iOS to "only charge when you're charging off green energy" you're being more green by only having to charge your phone every 3-5 days. The charge/discharge cycles are also reduced, so your battery is now lasting years instead of 12-18 months.