Your point is well taken, but this is why I emphasize that before gluing, the control surface must be deflected MORE than it will move in flight. The problem here is that if you fly with excessive control throws, this will create a larger gap than some people find comfortable. I have actually SEEN people move the surface, and then say, "That's too much gap" and then close the gap a little before adding glue. BAD MOVE.

So agexpert has a good point, if you plan to fly 3-D you may want to consider something like a Robart Hinge Point or other pinned-type hinge.