Cine4home had stated that convergence was more important in terms of the success of e-shift. From my own experiments as I have said many times, the benefits of near perfect convergence are actually overblown. We all look for it, and we all obsess about it. But in all the experiments I have done, the effects of mis-convergence on image detail is not as bad as some might think. It also depends on which colours misconverge. For example, red-green convergence has more effect than red-blue or green-blue. In fact blue has very little importance. Secondly, it depends on the image content. For example a scene where everything is green, will have no negative effect from misconvergence whatsoever. You can also see the effect of misconvergence by sitting on your sofa and intentionally moving the colour out and typically if that colour is within 1 pixel, you will not see much or any loss of detail as a result.
I would argue as Jason has already said, that it is in fact the optics that are most important.