Have you owned one?
The immense amount of work that went into making it a spatial compute platform stands out to me. It's not just something with low latency delivery of video to two eyes and a bunch of head and balance tracking. It's a compute platform that knows where things are in space, and what you're doing in that space as well.
To me, it's a totally different animal than a VR headset. I really, really hope Apple sticks with the platform; in 10 years, the hardware could be COMPLETELY different. It probably should be in a lot of ways.
But, the software and technology built that lets the OS maker, app makers and consumers engage with something that's spatially aware is huge. Huge. And that's a pretty hard thing to build, and will be a difficult moat to cross for new entrants. It seems likely to be the backbone of a major firm eventually.
To my eyes, the Pro demonstrates the (very early) viability of making spatially aware hardware and software, and sketches out the reasons it might be incredibly compelling for a variety of use cases, not just entertainment.
Anyway, I'm not too hung up on hardware here, although I stand by what I said, great entertainment experience, tantalizing work experience. All this work by Apple now could easily be re-pointed at, say, environmental cameras and microphones embedded in an office/living room, and work with projectors, thinner glasses, whatever. To me, the thing is the first viable steps toward a Spatially aware full stack operating system + hardware, and that is unique.