[Russell Sobie]

I think the thinking goes that if it's already too hard for half the grid to practice under ideal conditions enough to not pose a threat to the other half of the grid, throwing more variables at them would only make things worse. Also, I believe that clear conditions help those playing in VR see clearly, but I'm not totally up to speed on the visual quality of VR headsets anymore (got rid of mine more than a year ago now).