Really? I didn’t seem to have too many issues with it, especially compared to my experience with the Oculus Quest (where I can get headaches after 10 or so minutes).
After longer sessions with it, sure, but I don’t remember 5 (or even 20-30) minutes giving me issues.
I have some eye convergence issues, so maybe that's why. But my kids don't and they switched it off as well. Nice demo for the shop, though!
Yeah, everyone’s different, and it’s not uncommon for people to have very different experiences with VR, and I can imagine the same for the 3DS.