Bob Moore wrote:

Stick Shakers are not related to the deep stall. Stall Warning devices which include stick shakers are required because of a lack of sufficient natural stall warning
buffet in any airplane. The cure for the Deep Stall was the "Stick Pusher"
which prevented the aircraft from reaching the stalling AOA in the first place

I just started flying p/t as SIC in a Pilatus PC12. Never had any
exposure to a stick shaker or pusher, but the PC12 has both. Stall
training in that plane was *interesting* although I did't realize those
systems were driven by the AOA sensor and not airspeed.