I understand what you are saying Bill, and that DOES make sense. What I don't under stand is this.
Why does every full scale plane and all the models I have seen have a smooth, level, transition between the aileron and TE of the wing. (or stab, etc.). EXCEPT the 4*'s. When I look out the window of the 727 headed for Phoenix, I see a smooth flowing surface at the aileron. I am not trying to be a smart a** here.... I feel I have ask legitimate questions here.
I have only built 3 kits, and 4 ARFs in my 2.5 years in this hobby. All..... except the 4* has had tapered control surfaces. Do any of you fellas out there that fly Caps, Edges, and the like, have chunks of flat balsa, (or built up flat surfaces), for your ailerons, elevators, or rudder??? OR..... do you have a smooth, streamlined, taper of some sort???? I have seen many models and full scale planes in my 62 years, and I just can't accept flat hunks of balsa on my plane's control surfaces.
Of course, I am not an engineer, and I may not have all the equations correct..... but I am happy with the looks of my plane.... AND it really flies
terrific. That's just my opinion.

PS. Again... I do not taper the TE it to a point. I only reduce the rear thicknes by about 25 to 30 percent, and I don't round the TE, but leave it squared off.

...lownslo....... Bob