Like I said, misquoting me. That quote does not say "the pros don't know what they are doing". @TDS states that they try to hit the top of the ball when we all know all that produces is a ground ball. Isn't he saying that "the pros don't know what they are doing"?
Again top half is the aiming point.. Of course they are doing it from a leveraged position so they can attempt to see the barrel hit the ball out front.