If I can ask a hopefully not trivial question ... for a long time there have been not only stick shakers but, by extension, stick pushers. Was the Trident the first with this ? And how does MCAS differ in its principle to a stick pusher, apart from operating on a separate control, the trim rather than the yoke ? And if it's established, why did Boeing do it on a different control rather than push the yoke forward ?
There's an interesting account of dealing with this from 55 years ago here. Compare and contrast with what Boeing have done. "3,500 test stalls" !!!
https://www.flightglobal.com/FlightP...20-%200246.PDF