Plenty of great ballstrikers who don't make a tgm geometrially correct finish swivel so i am wondering with your post are you saying that the "intent" to make a correct finish swivel is helpful to compress the ball?
A powerful golf stroke requires that The Flail (Left Arm and Club per 2-K #1/2/3) work properly. In other words, the Clubhead must Overtake the Hands without destroying the Rhythm (RPM) of the Stroke. Classically, this is accomplished in three stages: Release Swivel; Hinge Action; and Finish Swivel. As the bridge between the Follow-Through (Both Arms Straight / end of Hinge Action) and Finish, the Finish Swivel is thus an integral part of the action. See frames 6 and 7 in Tiger's swing below. [Many thanks to KOC for the sequence. Click to enlarge.]
The requirements for a "tgm geometrically correct finish swivel" are satisfied when the In Line condition of the Left Arm Flying Wedge is maintained during the Snap Roll out of the Follow-Through into the Finish. That can be accomplished with or without the visual Flat Left Wrist. And golfers who grip the Club with a Turned Left Hand require less Left Forearm rotation than do those with a Vertical Left Hand.
Finally, there is at least one champion golfer -- Zach Johnson -- who does quite well omitting the Finish Swivel entirely. Hence the odd 'chicken wing' look of his Finish.
So, there are many ways to skin the cat . . . including not skinning it at all.
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