Writing is one of the finer motor skills we require, and we use lots of wrist and fingers in that. That's my reasoning anyway.
I think that the wristy stroke is a valid way to putt on modern greens. People have explained the reason why Jones & Co. used this stroke, but they have not given ANY logical reasons why it is inferior to modern putting strokes.
aeijtzsche,
I believe that putting is a fine motor skill, and not the silly gross motor clumsy motion of a shoulder rock or any other big muscle group. Our wonderful hands are what allowed us to jump out of the trees, and evolve into the most intelligent tool using species on earth.
Educated hands = golfers gungfu:
gung fu: (hard work) Learning one thing so well that you can do ANYTHING with it. In Kung fu it might be a certain type of punch that allows you to destroy 100 enemies at once; in golf it is our hands that control the club face. Learn impact so well that you can do anything with it: smash the driver, thread a long iron down a tight fairway, hit delicate pitches, and sink putts.