I will never understand why "the computer can tell what input it is receiving" has turned into an accepted threat model.

I understand that we have built a computer where our primary interface depends on running untrusted code from random remote locations, but it is absolutely incredible to me that the response to that is to fundamentally cripple basic functionality instead of fixing the actual problem.

We have chosen to live in a world where the software we run cannot be trusted to run on our computers, and we'd rather break our computers than make another choice. Absolutely baffling state of affairs.