Originally Posted by
aguadalte
That's when you turn on to the "feed-back" of your flight controls. When there is nothing more one can rely on, one would tend to feel the aircraft.
But when the control column feel at overspeed (vibration, unresponsive controls) is so similar to that of stall (stick shaker, unresponsive controls), one could argue that the benefit of active artificial feel is limited.
@Intruder, below - I was referring to the NWA 727 incident linked a page or two ago, where the pilots indeed mistook the stick shaker for Mach buffet.