VR has a fundamental problem
[May be a duplicate post, there was no confirmation after I submitted it the first time and I was
returned to a blank comment form].
I'm not talking about the fact that, apart from games, there's bugger-all use for it at home and, apart from a few specialist applications, bugger-all use for it at work.
I'm talking about the vergence/accommodation conflict (video. Your eyes converge when you look at close objects and are parallel when you look at distant objects. Your focus changes, too, depending on distance. Your brain expects both those changes to happen in track with each other, so you end up feeling nauseous or get a headache when they don't. 3D films these days get around it by limiting the
distance range of objects, but VR is meant to cope with stuff you can reach to pick up as well as distant objects.
I can't think of any solution that would be feasible, cheap, and not weigh too much to be usable. It seems that nobody else can, either, or it would already be on the market. Unless somebody does come up with something, VR is going to be too painful to use for long periods unless it only displays stuff that's beyond arm's length (at least that far, maybe further). You can use lenses to put the display at optical infinity and then there is no vergence/accommodation clash.
AR isn't so much a problem, as long as it doesn't pretend to show things further away than the display actually is. So HUDs are fine, but AR superimposing objects of varying distances is going to be a pain.