I think thats pretty simple: cost. I did it because the grip is so narrow for such a large pistol and I wanted to maximize the grip. I knew when I did it I would have to carefully hand fit the edge to follow that bevel, takes a lot of time. If you are manufacturing something you want to make sure you are back far enough that any slop will not go over the edge. In looking at many examples the horn grips get the closest to the edge, made a little more exacting. The vulcanite grips were really made so almost any imperfection would still work. Below is a picture of my number 1114 toward the end of production. The grips are numbered 1114 as well so they are original. The inner spacer is so far off that the grip is almost off the left edge. Grip is just not centered. The second picture is the other side which is much better. I think it’s called trying to make a profit? I know for a collector you want it all original but if I had the original grips they would be in the case not on the pistol.