[mfost]

I don't understand that point.

Of course you use gamma so that you have a more perceptually correct colorspace, mostly because 8 bit isn't enough accuracy to represent correctly the various shades of black the eye can percieve. Or because it's easier to make a perceptually linear gradient in gamma space.

But the blending in gamma space looks WRONG. It isn't perceptually correct! Try blending at 50% pure white and pure black and the grey you obtain is the wrong one, far too dark. Surely this cannot be what people want.