i generally dislike the presence of a killswitch or switches. there is a cause for removing as much physically moving parts as possible in mobile devices. you see others going down to 3 buttons to deliver a robust and reliable phone.
instead of a hardware switch i would be fine with a software switch if there would be a separate led showing the state. i assume the motivation for a hks is that a malware could turn on devices where that isn’t desired.
a led which is properly connected (not like we’ve seen in the past with certain webcam leds that were instead sw controlled) that reliable shows power status would be fine for me.