It is not just a monitor though. The fact that it tracks your movements makes it fundamentally different, it’s an entirely different kind of viewing experience, which might yet found a killer app.
There maybe some interesting new ways to display text, I'm surprised there aren't already more three dimensional visual apps created. The gucci thing is cool and some of the 3d aspects aren't that well done.
It would be great to ditch the phone, ditch the watch, ditch the laptop, ditch the tv, for mutable device that's whatever I want it to be wherever I am.
The big downside is that I don't want a big sweaty device attached to my head, fogging up my vision.
None of that is really spatial in the way that you're describing, but it's incredibly spatial from a user perspective.