The problem with viewing single eyes of a 3D transfer is that in general they don't do all the digital paint work to just one side, so each side is altered to make the 3D effect in a converted film, for example, if the shift is 80 pixels, each eye is shifted 40 pixels in the opposite direction...
Or perhaps not everyone feels as strongly as you do about the issue? I think it's a valid choice to more strongly de-grain when you're doing 3-D from film as it distracts from the effect.