weird, this is the same stuff the military worries about but I think they call it reducing SWAP (size, weight and power)

Display technology is another limiting factors for augmented reality. The transparent displays currently on the market have a limited field of view in which they can display graphics, are often not bright enough for daylight use, and generally could be better suited for all-day wear.

https://www.cnbc.com/2021/02/20/apple-facebook-microsoft-battle-to-replace-smartphone-with-ar.html