Xcitation
I take your point re testing in a very controlled manner, however when a real and unexpected stall occurs on the line, those involved have moved very far away from the contrlled environment of testing.
In the Bournemouth incident both crew were pushing full forward on the control column, but were unable to prevent the pitch increasing to arround 45 degrees. My point being that large control input is likely to be very necessary in order to be able to reduce aofa.
Your example proves how far removed real life can be from testing. No one flying on the line wants to go near the stall, but if they do it will be at the most inconvenient momoment and completely unexpected. Having a clear understanding of what to do is vital. Avoidance is the first step then recovery the second.