My 2 cents to answer #10...I have come to this conclusion after giving thousands of lessons over the years, and seeing hundreds of thousands of swings...the reason the practice swing is always better than when a ball is there, is because WITHOUT A BALL AND TARGET, THE PLAYER MAKES A CIRCULAR MOTION ON AN INCLINED PLANE VERY EASILY. ONCE THE BALL AND TARGET ARE INTRODUCED, THE PLAYER WANTS TO PUT THAT CLUBHEAD ON THAT BALL-TARGET LINE, AND THE CIRCLE SHAPE THEY ARE WANTING TO MAKE IS DESTROYED. It's the mistaken effort to put the clubhead tracking on the target line that ruins all chances of replicating the practice swing.
My 2 cents to answer #10...I have come to this conclusion after giving thousands of lessons over the years, and seeing hundreds of thousands of swings...the reason the practice swing is always better than when a ball is there, is because WITHOUT A BALL AND TARGET, THE PLAYER MAKES A CIRCULAR MOTION ON AN INCLINED PLANE VERY EASILY. ONCE THE BALL AND TARGET ARE INTRODUCED, THE PLAYER WANTS TO PUT THAT CLUBHEAD ON THAT BALL-TARGET LINE, AND THE CIRCLE SHAPE THEY ARE WANTING TO MAKE IS DESTROYED. It's the mistaken effort to put the clubhead tracking on the target line that ruins all chances of replicating the practice swing.
But only for beginners. Experienced players are way past this obstacle a long time ago. But still, you can see poor balance on TV among the greatest players in the world. From time to time.
Watching one of the pro tours on TV, it is often easy to predict the result by examining the balance & rythm of the players through their stroke. If they maintain balance & rythm, the putt will go in, the approach shot will end up close to the flag and the drive is likely to find the fairway. IMO, the loss of R is not the cause of poor shots for good players. It's the effect of the hand's effort to band-aid a poor swing. Sometimes the end result is good even though the players loose their R.
But good hands alone isn't enough to keep the game together for a long time.
...but anyone who does not know to go to the inside aft quadrant. Trying to hit the back of the ball and keep the clubhead on the line to the target ruins the shape of the circle.