No one has said a HUD yet? Being able to instantly recall information about objects in your environment, how to use them, red outline for nearby dangers, etc? Wouldn't even have to be Terminator T800 level for it to be immensely useful. Google Glass didn't get there, but maybe Apple Vision Pro can help pave the way.
Vision Pro lacks the sensors for that. They skimped out on direction finding capabilities, despite already having the tech in their phones (for their tags)
In their infinite wisdom they built it as a standalone single user sandbox instead of as an environmentally aware terminal
Windows based solution: will be super bloated, locked down preventing customizability, and will try to obtain as much data on you as possible to sell to advertisers, I'm sure among other reasons others here will gladly point out.
MacOS based solution: Even more locked down than a Windows based solution, hardware may even be more proprietary so good luck swapping out components yourself to fix it, and will try to obtain as much data on you as possible to sell to advertisers.
iOS: same reasons as MacOS, with the exception of it not being as locked down.
Android based solution: is controlled by Google and therefore will try to obtain as much data on you as possible to sell to advertisers.
Alternatives to Linux like other Unix based systems, FreeBSD, etc. I don't know enough about, so whether or not it would be better on this kind of a product I don't know.