Saying that XR technologies don’t make good consumer products is weird considering consumer VR products already exist and are used but alright.
…and why do you think that AR glasses have to be at least 1kg in weight?? That’s like saying laptops (or smartphones for that matter) will never be a mainstream product because nobody would want to lug around a 30kg machine. The smartphone I’m typing this on already weights just 150g.
We are still quite far from the limits of physics, and there are plenty of upcoming technologies which will allow to reduce weight.