Nats
The Airbus procedure I quoted exactly says that. I believe that you should not make your own procedures on FBW because you do not have access to the computer logics. Any problems encountered in line operations must be referred to the manufacturer. After all they have the software, the hardware, wind tunnel and test pilots. They are in touch with the operators on a global scale. Serious issue like recovery from jet upset cannot be decided by consensus. Discussion yes by all means, to share what all happens up there. But solutions must involve the manufacturer.