Still room for development in this critical area of the operation and I believe the onus lies with the manufacturers and not with operators trying to develop clever SOP's to double and triple check figures. etc... The aircraft should be able to do it's own independent "weigh in" somehow and tell the pilots at door closure or first engine start if their entered figures are within a given tolerance allowing for safe flight.
Indeed. The aircraft 'knows' how much thrust it is getting from the engines and the speed. It should calculate all it needs before even approaching V1 speeds