And we are only at the 'Motorola Bag Phone' stage of these devices. What are they going to look like to our kids when they are our age?

The Vision Pro in many ways uses a bag of tricks to work its magic: it scans your room, pulls that into its internal display and then overlays an additional video feed around that. Its still showing you a digital twin, albeit in 1:1 realtime.

Future hardware may well forego that solution and project the image into a lens a la Google Glass.