[Daryl]

Then the left arm moves independent of the body during hinge action?

Yes.

The Left Hand moves away from the body from Release to Both Arms Straight, either because the Right Arm is Straightening and/or CF and Pivot Thrust Blast the Left Arm away from the Chest (TSP).

I think that the Idea of "Gluing the Arms to the Chest" is a way to subjugate Arm Motion to a back-seat role while the Pivot controls the Orbit of the Clubhead. It's not so much about the Left Arm. Gluing the Left Arm to the Chest is a way to "Shut Down" the Right Arm. It turns you into a "One Arm Swinger" with one arm swinger tendencies.

Rather than Blasting the Left Arm off the Chest, a player increases Pivot Effort. All neophytes understand effort and for them, more Effort equals more Distance. Adjust your Grip and bend over enough for the Clubhead orbit to intersect the Ball and glue the Left Arm to the chest, then crank it up.

Power Package and Hinge Action is not easier to learn, but it's like learning to ride a bike. Once you learn, you never forget. It works for every club in the bag and on every golf course. And, Power Package and Hinge Action come with a valuable prize. A solid "Downstroke Acceleration Sequence".

It's not the easiest way to learn, but it's the easiest and most rewarding way to play.