I can buy what I want and also do what I want to what I purcwhased.

Or instead of that, people can engage in the entirely legal act of both purchasing it, and the entirely legal act of hacking it.

Customers have a legal right to do basically anything they want with something that they own.

First sale doctrine says if I buy something, I now completely own it and I can do as I please with it, even if it goes against any of the former owner's wishes or intent.

Apple bossing around its users doesn't increase diversity for anyone, it only artificially reduces its users' options.