Why might manufacturers specify an empty weight CG even if the aircraft is not flown at that weight?

Manufacturers specify an empty weight center of gravity (CG) to serve as a reference point for evaluating the loading and balance of the aircraft. This is particularly important because the CG significantly influences the aircraft's stability and control characteristics during flight. By establishing a specific empty weight CG, manufacturers create a baseline that helps ensure that any additional weight added to the aircraft maintains the overall balance within safe limits.

Maintaining an accurate record of the empty CG allows pilots and mechanics to ascertain whether the loaded CG remains within the approved envelope when baggage, passengers, or fuel are added. This is crucial as the position of the CG can directly impact the aircraft's performance, particularly during takeoff, flight, and landing phases.

While the other options may seem relevant, they do not encompass the critical safety and operational aspects of CG specification. The focus is primarily on preventing any negative impacts on the handling and safety of the aircraft rather than convenience factors such as pilot comfort or registration processes.