Although almost ALL modern golf instruction is a tragically flawed, cruel hoax, the area of horrendous advice that is almost universally communicated and causes the most damage is how to move the body (Pivot) in order to generate the forces necessary to whirl the arms, hands, and club into the ball.
The three main ways that golfers struggle with their downstroke pivot sequence are:
1) Overuse of the Lower Body
2) Wrong Sequence of Movement
3) Wrong Movement Direction
In my opinion, the problems that the aforementioned cause are the biggest destroyer of good golf than any of the other components that make up the golf stroke. Now, you can certainly still play poorly with a good pivot, but we just don't see it often. What we do see regularly are players that swing the club in a reasonable manner with their hands and arms, but still play AWFUL golf.
Many of the prescribed remedies that instructors offer to struggling golfers include:
1) Be more aggressive with the lower body
2) Transfer your weight sooner and get more on your left side at impact
3) Bump or slide your hips toward the target to initiate your downswing
The commentators during the PGA Tour telecasts exacerbate the problem by offering the diagnosis for poor shots as "he hung back on that one and didn't transfer his weight to his left side in time." The strange thing is that this diagnosis is offered for whether the player blocked the shot to the right, or pulled it to the left ???