The first advantage that jumps out at me is reliabilty in controls....you deflect a certain amount of aileron, then you bring it back to center. Sounds like flexing the entire wing requires more force, and more force to bring back to neutral- plus you wouldn't be getting a terribly great roll rate. You were able to have a much better medium to control those surfaces to- a control stick in between your legs....think WWI biplane, think basic lol.
Second one I can think of would be structural stability.....if you tried to flex a 767 wing like the Wright Bros plane, it'd have to be flimsy as hell to be able to do that, and thus, less supportave of weight. The wright bros plane couldnt support much more than 2 bodies, and definately nothing on the wings as those had to be moved.
"The cockpit, what is it?" "It's the little room in the front of the plane where the pilot sits, but that's not importan