I think that SVOTI is faster because it’s a bit lower detail/quality than VXGI. That being said, I don’t disagree it would be great to have faster, more usable realtime GI like Cryengine has, at the expense of some GI quality. I would love to have that.
What I wrote was just my thoughts on the reason why VXGI performs the way it does. nVidia is not looking at a present, on the cards they have already sold. They are looking in the future, at their future products they yet have to manufacture and sell, and they want to use their software research to maximize the value and profit they make out of their hardware sales in the future.