One of my favorite posts ever. Love the style and substance.
And finally: the truth is that relative to the target at impact the bowed wrist makes the face more closed than flat wrist when everything else remained the same.
But the arching does close the club face, right, not just deloft it?
What about this guy?
Deloft or closing the face?
Dustin Johnson DL 5i Slow Motion Golf Swing 300 FPS - YouTube
Greg, hold your left hand in front of you and arch your wrist. It opens like a door. I can't see how anyone can't see that. How you maneuver the face in your grip and turn your arm is independent of the act of arching your wrist. That move opens the face and delofts it.
What you are doing is TWISTING.
Not in the same plane.
It's pure palmar flexion without any roll except what that arching gets happen. I'd like to see if someone can get it open by getting from cupped to bowed.
So, not that simple as I said in my first comment.