Getting the shoulders to turn correctly pays huge dividends for the direction the arms and club move and how the body works. Proper sequence is everything. Watch to learn the desired shoulder movement.
Taking the hands out of the pitching and chipping motion breeds consistency in the strike and trajectory of these shots. Here is a great image of what these short game shots should feel like.
Throwing the club away from the body in the transition of the golf swing is one of the largest causes of poor ball striking and swing path. How can a golfer stop that?
Most instruction books will try and dictate that you must play the ball in a certain position in the stance. Here is why that is a fallacy and that we will all have our own unique ball position.
Will a perfect backswing find a perfect impact or downswing path? - No. So that's why understanding and becoming good at the 430 entry will find the perfect backswing for you.