I think that at some point in the future 'zero trust' will extend all the way down to the hardware level with individual components exchanging keys or otherwise nothing will happen. There simply won't be a safe perimeter within which you can trust another piece of hardware. And that's probably as it should be because a modern computer is better thought of as a network of - hopefully - collaborating processors than a single CPU with some RAM and peripherals.

Any one of those can be turned against you.