As I contemplate my next fix, I've become transfixed with the different designs for thumb notch area. There are many variations from a full tang width blocky shoulder to nicely sloped, full radius cutouts. So, I'm wondering about the plus/minus of each type and how it affects the feel, maneuvering, angle adjustment, grip, etc. Does it really affect anything? Are they just different appearance styles for personal preference? Both of my razors have blocky thumb notches and I was wondering if the thumb notch was worth paying attention to. I'm not worried about jimps, or rubber grips, or other things to aid with grip, just the thumb notch itself. Is the thumb notch design not really something that needs attention?