Problem with this: keep your phone with you always conflicts with don’t have secure conversations within mic range of your phone. You can’t do both of these.
But otherwise this is great and I would probably add “reset and replace devices often.”
But otherwise this is great and I would probably add “reset and replace devices often.”
It also prevents casual but intentional unauthorized access, just not a determined attacker.
As you note, there are other layers of security for that.