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OB Left - You wrote-: "All of this begs the question: Why arent there face balanced , center shafted irons? There must be a very good reason. We must need the rotation perhaps?"
Exactly. Golf is a sport where the golfer swings the arms and clubshaft around a rotating torso at an angle to the ground. We need the rotation because human anatomy dictates the need to rotate the flat left wrist/hand unit during the backswing to get the hands far enough back (near the right shoulder) and human anatomy dictates that the golfer must perform a similar reverse-rotation (as a mirror image movement) in the followthrough/finish phase. The clubface will only be square to the ball-target line at impact. During the downswing-followthrough motion, the clubface rotates from open to closed because it is moved in that manner by the flat left wrist/hand. At no time point does the clubshaft rotate about its longitudinal axis (like a spinning top). If it did, then the idea of an axis between PP#3 and the clubface sweetspot, and the idea of the hosel rotating about that axis, may have some definite relevance. So far, Yodas Luke has only inferred that the imaginary straight line between PP#3 and the sweetspot has relevance during the takeaway. That's only a small fraction of the clubshaft's total movement during the golf swing.
Regarding the issue of shanking, I think that a major causal factor is a failure of a golfer to understand that the clubface must rotate from open-to-close through the impact zone, and that the closing clubface phenomenon is due to the release swivel action where the flat left wrist/hand rotates 90 degrees in the late downswing. I think that the mental idea of the "clubhead rotating about the hosel" would actually help those golfers because they are essentially dragging the clubshaft towards impact as if the clubhead were center-shafted. I think that they need to realize conceptually that the toe of the club must rotate about the heel of the club during the pre-impact phase of the golf swing, and that it will happen automatically if they correctly rotate the back of their flat left wrist/hand.
Jeff.
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