What prevents the sim programmers from modeling at least part of the stall characteristics of the Airbus off of the AF447 FDR data?
AF447 crew walked the narrow path through what is completely uncharted territory. We have no way of finding out whether the astoundingly stable behaviour of their 330 at extreme alpha is general rule or whether they have through sheer chance found the power, weight, CG and control input combination that made their aeroplane fall in parachute-like manner instead of departing into violent oscillatory spin. Also there is no point in finding it out through forcing passenger widebodies to AoA way beyond critical one in course of flight testing. It would inevitably lead to destruction of a few of them and idea (which is still valid) is that pilots will properly react to stall warning or at least start recovery as soon as aeroplane truly stalls. Most of them still do.