To be honest this thread has been eye opener for me too. I now have a better appreciation of the difference between the sweetspot plane and shaft plane. Thanks for that.
Close your eyes and swing. That feeling, that weight at the end of the shaft feeling is the sweetspot, the longitudinal center of gravity. Not the shaft or merely the clubhead. We thrust that COG knowingly or unknowingly at the target (aiming point).
Makes it sound like an easy game, eh? What could possibly go wrong?