It's not about an individual's tolerance, it's because the phones are not capable of having a refresh rate that's fast enough for your brain's ability to process it. That's why all the serious VR headsets right now require a physical cable. https://www.youtube.com/watch?v=rBtXMtUNpdE

It's going to be a very long time before mobile phones are capable of refresh rates sufficient to prevent this issue. The fastest consumer graphics cards are barely capable of keeping up with this rate as-is. Aside from being yet-another proprietary SDK for VR development, Google VR is DoA regardless because it depends on a hardware platform that simply won't work well for what it's trying to do.

Please let's focus on WebVR. Please?