Take off weight is calculated anyway. Airport crew could do it based on calculated weight comunicated by pilots. With current technology it could even be autom

Take off weight is calculated anyway. Airport crew could do it based on calculated weight comunicated by pilots. With current technology it could even be automated - pull the airplane 10 m at a fixed (low) power setting, determine how fast it accelerated, calculate mass, increase power accordingly for the rest of the takeoff distance. Even an Arduino could do it. Or simply apply the maximum force supported by the airplane's attachment point (front landing gear) no matter what the weight is. Airframes would probably not need much strenghtening. I expect that the forces from wheel breaks are aprox. the same. PS: With a catapult / winch launch, the MTOW could probably be increased a little - more passengers and cargo for the same flight costs.