Earlier quoted context omitted.
> interchanging parts on two brand new iphone's and it disabled a lot of things including auto-brightness. I think one problem is not being discussed enough is iPhones being stolen for parts (since in most cases they can't be reactivated). I strongly suspect inability to simply switch parts without remote authorisation is Apple's way to address the problem.
Okay, let's discuss it then. Why do I need Apple's consent to repair the device I paid for? Why is there no way for me to (even temporarily) disable this feature if I actually want to fix my phone?
You want to be able to temporarily disable a feature that Apple introduced to prevent from installing potentially stolen parts in your phone?