This has very little if anything to do with security, it's about control and profit. Apple makes good profit with apple store repairs and wants to prevent repa

This has very little if anything to do with security, it's about control and profit. Apple makes good profit with apple store repairs and wants to prevent repairs from happening outside their grasp to make more profit. Security is designed against a threat model, the vast majority of user do not have to defend against "malevolent third party repair shop planting hacked hardware during repairs". The main culprit for this kind of attack is US governement agencies engaging in interdiction (intercepting hardware during shipping to alter it) not third party repair shops (and IIRC apple works with those US agencies).