I appreciate your view on the usage of extension cords.
You quoted the NFPA. In that quote UL certification is disparaged. There are few finer groups than UL. Perhaps the NFPA should blame the testing standards rather than the testers.
Please note that:
The NFPA comments are not part of the NEC.
The NEC stops at the outlet.
The NEC and NFPA have no authority over what is plugged into an outlet. In particular, the number of extension cords between the outlet and the appliance is a matter of the users purpose not an electrictians.
