Seems to be simple math. To render a 4k screen that looks to be 10 feet away on glasses a few inches from your face you need an order of magnitude or two pixel

Seems to be simple math. To render a 4k screen that looks to be 10 feet away on glasses a few inches from your face you need an order of magnitude or two pixel density more than the screen. Then you need portable hardware to render it and a battery to power it. All of those are far ahead of what we have now.