Al,
I think it has more to do with the rules of the respective classes than one being better than the other. I know that in shortrange br (HV and LV), the angle of the buttstock has to intersect with the barrel no further than 18" if a line were drawn from the bottom of the buttplate to the barrel. The unlimited classes in shortrange BR (railguns) are not limited by this. In long range BR the rules allow for no drop in the toe, and would allow the stock to track straight back. Based on the current groups being shot in the shortrange game, I don't know that it's hindering people much.
Hope this makes sense.
Mike