Of course, when someone says that they want one for use "at the edge of the flight envelope" the hairs on the back of some peoples' necks stand up; do you want one so that IF by chance you get to the edge of the envelope you can use it to more safely return to a more normal flight condition (good!) or do you want one to have increased (and possibly misplaced!) confidence in going to the edge of the envelope in the first place (not good!).
Its the "safer car design" argument - do we save lives by making a design 'safer', or do people simply adjust their conduct to the presence of the new feature, taking additional risks to end up at the same overall hazard?