4/ If productivity AR apps (and maybe any AR apps in general that need complex input) ever take off, I think we’ll see the next wave of skeuomorphism. You’d manipulate something close to real objects on a table or in your room instead of flat controls on a floating flat screen.
5/ Input fidelity plays a big role. Controls had to become bigger to become touch-friendly on mobile. In AR, tracking target is closer to the size of you hand, or at least a few fingers, especially in early stages hardware may not be powerful enough for detailed finger tracking