Sgian Dubh
Virgil, I don't know the article to which you refer, but now you've mentioned cockbeading being a reason for the technique, it brings to mind the alternative solution to that conundrum. Assuming we're talking of extruded butt hinges, the alternative is to make the cockbead with a diameter and resultant arc that largely matches the hinge knuckle, and then cut the hinge recess so that the knuckle lines up with the bead. This can result in double depth sinking of the hinge into whichever part has the cockbeading, so still presents the same alignment challenge at installation of the door that the sinking of a leaf into each part helps make easier.

Who is to say which technique is correct? Not me, ha, ha. Slainte.