My sample size is much larger and indeed that has been the case. I've been hosting VR demos for 10 years now, since DK2. DK1 was bad news for people even slightly prone to motion sickness. 3dof is only viable for motion sick prone people if they can keep their head exactly where the game expects it to be, which you can't.

With each new generation of headset, there has been so much less prep for getting random people into it and making sure they wouldn't even get mildly nauseous. More software options without translational movement and much less obvious safety nets in games that do. You can always find at least one game/experience that is right up someone's alley that won't cause motion sickness even if it turns out they would otherwise have been really sensitive to it.

But I always let them know that when they do want to start branching out from the "safe" choices, that they should treat it like sea sickness, limit exposure at first and build up sea legs. Ideally never get to the point where you would throw up, try to stay as far away from it as possible while still having fun. You will eventually notice one day that you haven't thought about it in a long time.