In Slovenia, devices have to be turned off the moment they are seized by their owner, prior to putting them into airplane mode.
It feels like something that needs to be as easy as possible, for safety reasons if not anything else.
Now what I'd like to see is an extension of their protocol that is used to locate iPhones that would also let them accept a "remote wipe" command, even when powered down.
Downside is that you need to manually disable the automation if you actually wish to use airplane mode (and also remember to re-enable it when done)
Theft Detection Lock uses AI, your device's motion sensors, Wi-Fi and Bluetooth to detect if someone unexpectedly takes your device and runs away. If Theft Detection Lock detects that your device is taken from you, it automatically locks your device's screen to protect its content.
I can remember to disable the shortcut whenever I fly and need to enable it.
If they pop my SIM (my provider doesn't use eSIMs...) then there's a PIN on it to prevent use in another device.
iPhones are still trackable while powered off, at least for a while.
How often do muggers carry foil pockets even in first world countries? Certainly not in places where there's a mugging almost every week. Some way to track the device on its way to wherever they strip them off for parts would be helpful than not being to track it at all.