It looks like the Bosch solution is an AR iPad app. I was really thinking about the challenge of developing a full headset for welding. https://www.boschaftermarket.com/gb/en/diagnostics/solutions...

It wasn't totally clear, but it looks like Mount Sinai might be using Microsoft hololens.

It does seem like John Hopkins has something interesting.

I am not saying it is impossible, but I certainly would not say I was "surprised" Miller welding has not developed full AR glasses for welding. AR is hard and this is early days.