How about "Form follows Function" ? From an anatomical or ergonomic viewpoint, Fuzzy's design makes more sense. The tapered grip fits the hand better than the flared grip. Sometimes the way things have always been done is not the best way - that frame grip design probably dates back to the single action days ........
"Still, it's hard to imagine anyone doing this to a gun of this quality. This is a high percentage gun."
Why, Giz? It was bought to shoot and obviously, the owner liked the feel of a set of Fuzzy's grips.
I took a new M25-5 and roundbutted back in 1980. It fit my hand better. Did the same thing to a new 4" M24-3.