I was just thinking that with the new side button that requires you to hold it to launch Siri and double tap to launch Apple Pay, does this mean you can no longer hold the button to power off the phone? If so, I think that would be great. One flaw with Find my iPhone is that you can get around it by turning off the phone if a thief stole your device. iOS 10.3 or 11 (can't remember) introduced the software option to Shut Down in the General Settings. If that is the case, could it now make it a requirement to unlock the phone to even shut it off?