Yes , but the point is that many pioneers demonstrated well controlled flight without either ailerons or wing warping,showing, I suggest , that roll control cannot be argued as a prerequisite for controlled flight
Well I am not really in the Wrights' supporters' enclave Haraka but I would personally say that one is not really in
full control of a conventional aircraft unless one has roll control,I am not saying that one cannot fly without roll control - obviously - but as I am sure you are very aware - In aviation you rarely get something for nothing and if you design an aircraft without roll control it will have quite severe limitations !
Relying on secondary effect of rudder for turns is ponderous - especially near the ground !