If every layer of abstraction and emulation is set up to allow it to pass through. It still seems really impressive to me, like lining up a bunch of targets and shooting an arrow through to get multiple bullseyes or something, haha.

Hardly, the benefit of binary is if everything lines up once, it always will. It’s not an analog world with pesky things like wind resistance.

Sure, if you happen to own the control stack from hardware, OS, drivers, to client software and are willing to never change any of it once you get things lined up.

It’s not really all that hard

Would you say this is not impressive work? Or how come you're saying it's not hard?

It’s just exposing a couple bits in ACTLR_EL1 to userspace, nothing to it really

Why not? In fact they are using it right now.

I think the comment was saying “there isn’t any reason they can’t.” Which is true in theory, but in the practice it seems to be a lot of stuff to line up.