VisionOS has some of the most incredible, coolest engineering I've seen in a long time, from top to bottom. Even if you're not interested in AR/VR, the writeups and sessions about the dual processor OS layout they've used, the scene and room graphing technology they've built, and the challenges of building ultra low latency pass through scene reconstruction and mapping are incredible.
Vision Pro might honestly be one of the technically coolest things built in the last 10 years, and I really hope they get the price down and fix some of the UX (weight, battery, etc), because it is something I use every day (and in fact, am writing this post on right now). It's for sure a Beta/DevKit/etc, and I wouldn't recommend the casual person to buy one, but again, on engineering chops alone, it is a masterpiece.