This is more like your Tesla car's keyfob misfunctioning and you get it repaired by a non-Tesla dealer. The dealer could've put in a backdoor to get into the vehicle.
Tesla releases a big new update for their car software and now your Tesla is completely bricked and Tesla refuses to repair it, saying you have to buy a new car.
Is that acceptable?
Apple or other authorized repair shops can still fix phones that have been disabled due to security chain errors.
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.
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 you don't.
The repair shop didn't repair it properly, if it was repaired properly the new TouchID sensor would be securely paired with the Secure Enclave and this issue would not occur.