I mean, you’re wearing a VR headset for hours without a break and expect no ill effects? Doesn’t seem fair to blame the equipment, you’d probably get sick from watching a roller coaster or flyover video on a flat screen for hours on end.
I can play Elite Dangerous in the space ship for nine hours straight with no ill effects, but 30 minutes in a rover in the game destroys me for days. It depends on the setting.