Before AF 447 there was nothing to suggest that autotrim concept as applied to FBW Airbi is flawed and I guess that even after final report is out it won't change.
Clandestino
I don't know much time you have in tactical jets, but you have enough chutzpah to have come to aviation that way. This is not a criticism by the way.
The performance of the autotrim system in this corner of the flight envelope likely does not meet certification requirements. Certifying this feature in Alt 2 at the stall was probably not envisioned in the initial requirements due to the high anticipated reliability of the airspeed system. It fell under the category of too improbable to worry about. Today we know that line pilots actually bumped into this corner of the envelope.
Despite Owain's assertions about relative power of the elevator versus HS (and I believe he is quite competent in this field) he was not working with the best data and his results may be slightly skewed.
Consider the Perpignan A320 and how throughly the THS overruled the elevator. Different aircraft, but designed by the same team with similar design philosophy.
Yes it is possible to stall the Bus in ALT2 using just elevator and thrust as we saw demonstrated by AF447, but who can say,
had the trim had been limited, whether or not the crew would have seen the airspeed come off the peg a bit during one of their nose down trials and continued their nose down efforts.
THS running full nose up is a potential serious hazard and needs to be guarded against better. How to do that is one for the engineers (design type not wrench type) to puzzle out, but judging from what has recently transpired with the type, it may save two or more aircraft in the future. Expecting training to handle the problem completely is not realistic. If we see nothing in BEA's final accident report addressing this problem, then you should be concerned.