I worked on our VR mirroring and capture system, I wouldn't say it's "impressive" but I consider it pretty cool.

https://www.slideshare.net/ConfluentInc/kafka-summit-nyc-201...

Also our three.js and AFrame integration was pretty difficult to get working. We real time synchronized the scene graph in the V8 context into Unity.

https://developer.altvr.com/

Also a huge challenge was delivering a good experience on mobile. We spent a ton of time on browser integration, rendering, and networking performance to hit frame on low end mobile VR devices. Our commitment to having it work on mobile, combined with our limited resources, led to us having a lot of "least common denominator" type things happening which leads to PC users thinking the app is simplistic or underdeveloped. But being able to have people on lower end devices join in the community was well worth it. I'm sure with enough time the people at Microsoft will invest the work in getting the PC experience to "progressively enhance" further than what we were doing already.

Disclaimer: former co-founder, no longer w/ the company

Unfortunately, this is pretty true. I tried to work with them a bit as a 3rd party content provider and I was shocked by how little secret sauce they really had.

Have you ever made anything?

Comments like this sound like the non-technical manager who rattles off an idea and says "that's easy enough right, should take you like 20 minutes?" about what would be a week long project just to get a prototype.