What they instead achieved up to iOS 10 was:
* worse location data in maps * airdrop does not work * AirPlay might not work (doesn’t work across networks) * Handoff doesn’t work * phone call and sms forwarding doesn’t work * applications don’t auto update in background anymore * system updates are not downloaded in background anymore * might waste their data plan
I think it’s impossible to have people know and be aware of all these side effects. It’s much better to change the UI: have the common button do what people think of and know it does: get off a network. And have the more comprehensive shut down button a couple of taps deeper in settings.