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I agree that using it as an unlimited display would be a great application. The only problem is that the device itself is too heavy for long-term usage, which goes back to the technology not being ready yet.
Maybe if all that you put on your face was a screen, and the rendering and power were offloaded to a desktop it could be made light enough to wear for hours at a time.
ETA: I haven’t had trouble with external monitors on Mac, and I’ve been running dual screens since 2002 when I grabbed an old 20" CRT from the garbage outside my dorm.