Do you really want to draw a virtual circle on your wrist to know the time?
I mean, I -get- the novelty of what they are doing, but big inputs, for what should be easy tasks (like knowing the time) should not take big gesticulation. ...that's way too playschool to be an effective '6th sense.' (as they call it.)
fwiw, personal augmented reality has worked pretty well using sort of 'heads-up' glasses for the last decade, plus.
btw, would you really want other people seeing
your projection on some acquaintances shirt? I mean, like the TP, what if you have notes that the guy is a big ass-wipe?