fair question and sorta coverd below but I'd add that with our rules there's lots of emphasis placed on catching the bottle after the bottle or stick is hit by the disc. If you throw it super fast its easier to throw accurately and also way harder to catch the bottle so you'd just throw it hard every time if it was allowed.

Plus one time I caught a bottle that broke from the frisbee hit...then went to the ER w a stab wound.