Earlier quoted context omitted.
It may even be against the law in Europe because the phone was working perfectly after the repair and only the later update locked the phone without the ability to unlock it. To keep with the care maker example, in Germany, the car makers used to void the 10 years guarantee on the painting of the car if the regular checks were done by an independent car shop. This was then declared as illegal. I suppose Apple will so…
No, the phone did not work perfectly after the repair. The fact that the user didn't realise it didn't work perfectly doesn't change that. The repair compromised the security of the device. Image if you have your tires changed by an independent car shop and a month later one of your wheels falls off on the highway. Do you start complaining about it to the car's manufacturer because 'it worked perfectly before'. No yo…
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.