[xrcltr]

Except that the wheels didn't fall off the phone. This lockup happens due to code proactively added by Apple. You are confusing three different issues: the design of the system, the legality, and how security should work. In this case, none of those three items align. This is Apple's problem - they chose the easiest option for themselves, not what would benefit customers legally, functionally, or by securing the device properly.

You are fundamentally misunderstanding the threat model. What is the exact threat that Apple is guarding against? Is it an evil maid attack planting new sensors, switched devices, someone's fingers being cut off? All of these require different mitigations - none of which for a general purpose consumer phone are to brick the device when upgrading.