"The purpose of the golf swing is to create solid impact and hit good golf shots. THE METHOD EMPLOYED IS OF NO COSEQUENCE AS LONG AS IT CAN BE REPEATED". John Jacobs
Unpack your quotes a little. You leave this post open to multiple interpretations, at least one of which you clearly consider to be deeply insulting.
Do you have your own opinion on "What is optimal?" If so, please share.
I think a static definition of optimal is going to be pretty hard to determine. I posit that optimal will mainly have to refer to ball-flight rather than the mechanics of the swing, simply because no two swings are exactly alike and yet many different swings can produce the same (or extremely similar) ball-flights.