It's possible they have a licensing deal with MS that forces them to do this, the same way Amazon dictate that they must have the best price on a book. Then ag

It's possible they have a licensing deal with MS that forces them to do this, the same way Amazon dictate that they must have the best price on a book. Then again, I find the simplicity argument somewhat convincing as well. NVidia's unified driver model must be hellishly complicated anyway, anything they can do to keep control of the complexity is probably something they'd greet with open arms.