So does eyesight. If the "ghost ring" is too close then it's more of a ghost than a ring. If I wear my prescription glasses to see the aperture, then I can't see the target. There are tradeoffs. I'd rather have the rear sight, whether it's a notch or an aperture, farther away, even if my sight radius is reduced....
Stock fit also has a lot to do with how fast either sight type works.