Originally Posted by chauncey
Is this assumption wrong?
A lot of good ansers above, but the short answer is yes! You are confusing double hauling with the ability to cast far, whcih it is certainly needed to reach the farthest distances. As others have said double hauling is a tool with many applications.
Although loop size is controlled by another action, it is certainly easier to control loop size if you are a competent hauler. Accuracy improves, line speed improves and casting into the wind improves. As others above have pointed out. The only negative of double hauling would be to use it to throw too long of casts instead of getting into proper casting position or properly mending your line while in the air.
Hope that helps.