http://www.schnitzskis.com/images/926_DSC_3770ab_Nate_Smith.jpg
If you look at this picture it does not go slack but still does move a bit. The upper portion of the triangle is not straight with his arm. If it was straight the Pythagorean theorem would be exactly correct. It is not though it goes up a bit. It is not quite as much as the equation would give you. But I would agree that you get a tad more reach. I guess in something that every bit counts it could help.