Which comes down to framerate, not detail. Put somebody in a grayscale world with simple geometric primitives (something even a mobile processor could render back in the 90s) with sub-60 framerates and people will get sick.

Most gamers that I see nowadays are all about the detail. Crank the AA up to max, the texture resolution to max, draw distance, and so on. If you lose a frame or two, it's not a big deal as long as the average is 60+.

VR completely reverses that - losing frames destroys immersion and causes motion sickness. Since even a fax-machine detail world still produces presence, we can easily sacrifice some detail for better framerates.