Volume is correct about the inability of flight simulators to accurately replicate the real aircraft's post stall behaviour. Test pilots do not take commercial aircraft that far into the stall regime, and certainly not at high altitudes, it is simply far too dangerous. Therefore all the models used in simulators for post stall behaviour are based on extrapolated data and wind tunnel experiments.
Pilots should not assume that what they see in the simulator post stall is correct. In fact it is positively dangerous to do so.
I would be very interested to hear from 'those in the know' what the industry is doing about the conclusions of the work done by the IPTC. Why are the regulators dragging their heels over requiring improved training? Are airlines implementing the recommended improvements despite a lack of response by the regulators?
See:-
ANALYSIS: Modernising global airline pilot training - 1/12/2015 - Flight Global