Right. Beat Saber works because the virtual world does not rotate relative to the real world. That rotation is what induces nausea. The player is confined to a small box in the virtual world; they never move very far, and the virtual world is locked to the real world.[1]

Games with that constraint are limited. You could do ping-pong. Shooting galleries.

[1] https://www.youtube.com/watch?v=gV1sw4lfwFw

Ok but it's not a tech demo or some proof of concept. It's a fully fleshed out game with high profile DLC and a strong mod community. Nausea has nothing to do with this.

I'm not sure your understanding of VR motion sickness is quite right. Most people are completely fine with teleport locomotion which is sufficient for a huge class ofs games.

Also cockpits seem to reduce nausea thus opening up another broad category.

It's mostly smooth first person motion with strafing and smooth turning that is problematic.