It's not that Pilatus have cut corners and the PC12 is too dangerous to fly without the pusher
Yes it is, it either means that the elevator doesn't have enough authority to recover in the stall due to aerodynamic effects eg super stall.
Or it displays stall behaviour which the average competent pilot wouldn't be able to recover from.
If the plane doesn't need it they don't fit it.
With that much torque on the front from the turboprop I imagine if the wings are stalled and you fire wall it the hull is going to start turning the opposite direction and the rudder won't be enough to stop the yaw.