That's right. The cause of motion sickness is when vestibular input (sense of physical movement) does not match visual input. If I am standing and moving naturally in a VR world I can stay there for hours without feeling nauseous. FPS or flight sims cause VR sickness.

VR sickness is the inverse of car sickness.

- VR FPS game: Visually moving while physically static.

- Car passenger in back seat: Physically moving while visually static (car interior).