Ribs, beads, barrels are all just in the sight picture to give the eye a reference point to use in the quest to get the shot where you are looking. It is not like using iron sight on a rifle where it is important to line them up and have them in perfect target, front sight and rear sight picture to get the bullet on target. Some of us see all the rib and other see almost none of the rib.

I place far more value on point of impact than anything else. If the gun hits where I am looking then the beads and ribs are not that big of a deal. If it does not hit where I am looking then no sighting down the rib will make it right.