I cannot change the size of the screen with the ELF-SR2. I can many screens of varying sizes with a tethered AR display. With this, we are still looking into a box, maybe a cool and expanded box, but still a box. AR allows screens to be anywhere in the world, and the majority of consumption for traditional spatial mixed reality AR technology (so many words, so much confusion) is developers sitting at their desks working on prototypes. If I can spend $1,500 on a fancy monitor, I would rather spend $1,500 on a comfortable device that gives me many monitors. Take the computing, batteries, and the idea of stuffing it into a device under a pound and likely the price point becomes much more acceptable for adoption.

Edit: Can no longer reply to say, I think it is mostly executive bias from the mobile age that prevents the best optics from being used in a tethered format like this. Executives needs to stop seeing smartphone replacement and start seeing monitor replacement if they want early traction. Some startups building devices like this but few have the budget and amazing optics.