Using the arms to move the arms guarantees that you will make physical adjustments and compensations in a swing. It guarantees that Newton’s 3rd law (for every action there is an opposite and equal reaction) will kick in and your swing path will be kicked off path to some extent….
Using the arms to move the arms into the backswing makes golf WAY more difficult than it need be.
I would love for you to be OBSESSED with learning to use your core to move the arms into a SWING! Heave the tension out of the arms so that they swing with sufficient force to sustain the swing and then GRAVITY and ROTATION can dominate the swing, creating PATH INTEGRITY!
I’m not saying it’s easy to get the arms out of the arm swing, just that it is SO SO worth it if you learn to do it!
Most of you know the drills that will teach you how to do it. Are you training in them?