Automatic systems should not assist you in taking the aircraft outside the demonstrated envelope.
(my bold)
MACH: The elevator alone took the aircraft out of the demonstrated flight envelope. The THS behavior you find objectionable occurred as a result of being outside the envelope.
The flight test stalls performed in the aircraft were done at specific weights in specific configurations with specified CG's and at particular altitudes.
The three test data points for each stall were onset of the stall warning, onset of buffet and a termination point which was generally associated with a 'break' in the VSI occurring, a result of either 'pitchdown' or 'pitchup' depending on config. They are very structured and after that termination point you are 'out of the envelope'.