You would only really gain an advantage on a 3x3 If you were 'slow' an by the time you had built up decent recognition using the internal pieces, you would probably be to fast for it to be an advantage. but an advantage is an advantage, and I guess it's just not worth taking that risk. As for the UWR, I doubt anyone would claim it to be illegitimate, bearing in mind I'm pretty sure 5blds UWR ao100 was using keyboard timing.