One other point.
Inertial effects on the sidestick - or rather, the pilot's arm operating it, at high +Gz and extremes of bank angle? A state with which he would be unlikely to be familiar...
...and which no simulator 'upset training' can replicate.
When I flew one of HM's jet bombers, we were taught NEVER to exceed a RoD greater than your height in thousands of feet. So, at 10000 ft, 10000 ft/min was OK, but at 2000 ft, 2000 ft/min would be the limit. And so on.
The crew got themselves into uncharted territory as soon as they exceeded the AoA value at which the test should have been abandoned. Very shortly afterwards, sadly they were totally out of their depth.