I don't think (consumer) VR will ever take off.
it was tried in the 90s. It's currently being tried in the 2010s-2020s with massive investment and hype but little mainstream success.
I feel like VR is going to become one of those perennial technologies, like 3d movies, that comes back every now and then with a new "innovation" (like IMAX 3d, home 3dtv etc), has a novelty boom, then fades away only to return again
The missile knows where it is at all times. It knows this because it knows where it doesn't smell like missile. By subtracting where it smells like missile from where it doesn't, or where it doesn't from where it does (whichever is greater), it obtains a difference, or deviation.
I operate by Crocker's rules[1].