Lynn makes a very good swing (and hit) at the ball.
No doubt.
My left wrist is flat a bit longer than Lynn. So what?
Well the so what is just what Lynn is saying, The golf stroke works BACKWARD from a wobbly point and that point---even if it is after impact ---can start to cause problems.
I have seen many Flat Left Wrists in my time, and I've got to tell you, I've never seen it done better than by Brian Manzella. When he graciously called me from his 21st PGA Coaching and Teaching Summit last month and handed the phone to his mentor, Ben Doyle, the FirstAuthorized Instructor of The Golfing Machine, I was flabbergasted. [There are only a few times in life where that word works. This is one of them.]
My first question?
"Mr. Doyle, how did you teach Brian his Flat Left Wrist?"
His immediate answer:
"Chip. Pitch. Punch."
And there you have it, guys. Fifty years on the Tee in Three Words.