[Daryl]

Well, I agree that the TSP isn't for everyone. I also agree that the Elbow Plane is more natural although I think that Homer's use of the word unconscious meant "without consideration".

But release motions need to occur on the same delivery line or else the clubhead orbit becomes 3 dimensional. So, those with Hand paths not matching the Clubshaft plane or vice-a-versa, will need some mechanism to arrive at impact without bending the delivery line.

Ben Doyle has suggested that the Plane might be concave. I haven't found much to support that but I find lots of ways golfers get-around the problem.

That's a problem that anyone with a downstroke plane shift must resolve (Hand paths not matching the Clubshaft plane). "Plane Shifts are Hazardous".

But anyone with Hand paths matching the Clubshaft plane can use a Flat Left Wrist Throughout the Stroke and a TSP offers that and more.

Most of my video of Hogan's swing shows that he mastered getting the Clubshaft On plane at the end of startdown, yet he still used the Hogan Swivel where a Flat Left Wrist would work perfectly well. With Shorter clubs he didn't do as well so maybe he figured keeping it for all strokes was better than forgetting to use it on shorter length clubs.