If you want more distance, it's important to make a full shoulder turn.
Rotary tension is power generated by pitting rotation against resistance.
An example is a toy plane with a propeller attached to a rubber band. When you rotate, or wind the propeller, the rubber band builds resistance by getting tighter and tighter. The tighter it gets, the more resistance it provides, and the faster the propeller spins when you let it go. A loose string in place of the rubber band wouldn't provide resistance, so the propeller wouldn't spin when released. The golf swing works the same way.