Things all my mobile devices have:
Hardware-based encryption
Tamper protection
Remote backdoors
Activation lock
If one of them gets stolen the loss will only be financially. Also stealing and tampering with the device will just end up bricking the entire thing unless you know the passwords to circumvent such restrictions. So good luck stealing and selling it.
@JoshuaACasey well, Graphene OS doesn't let me do activation lock. If I can't ensure people will just wipe the thing and do whatever they want it would be all useless.