Agreed, but layouts such as Pentile don't actually have all three subpixel components in a logical pixel, so you'll still get artifacts even with grayscale AA. You can compensate for this by masking those missing components.
surprising info, I thought this was supposed to be the part about "display controller taking care of any additional issues", thanks for link with details, will read it with interest
https://github.com/snowie2000/mactype/issues/932