So long as there is no PII, what is the problem with that? If you mod something that's in warranty and you knowingly void it, that is your problem; same is true for every single manufacturer out there.

> If you mod something that's in warranty and you knowingly void it, that is your problem

The ability to fix your own phone isn't just your problem. It is also a problem for the person who you sell your "fixed" phone to. It is a problem for the second hand phone market (edit: the market clearing price for lemons). Allowing parts interchange is a problem for theft (if expensive parts from parted out stolen iPhones can be used to fix other iPhones then stolen phones have high value.)

Edit: that said, I do want to be able to fix my own phone. I just don't agree that I am the only person affected by that ability.