I used to do a lot of research in 3D imaging, and my take is that passive stereoscopic glasses were always destined to fail because they cause eye strain for too many people. And that eye strain is usually caused by the fact that the focal point is fixed, and a lot of eyeballs fight that when they see a three dimensional image. We’re used to being able to shift focus at will with real-world 3D space.

This problem doesn’t impact everyone, and it’s not as bad with immersive experiences that keep items sharp in the foreground and background, or with films that don’t have interesting shit happening the background.

That said, it’s a really old and well documented problem, and I don’t believe we have affordable varifocal viewing solutions on the market yet.