So what would make this flight different?
Some maintenance was done in between. Which may have made things worse if curing the wrong symtoms...
This report will make interesting reading purely from a human factors point of view
I just hope real human factors specialists will be involved in writing it. For sure this will have many very interesting aspects.
I wonder if when the nose dropped each time, this motion caused an illusion that the aircraft had just entered an actual stall.
Especially as the reduction in g load would have been much stronger than any simulator can do, further creating confusion and raising adrenalin levels. The body of most persons reacts vilently to reduced g, and most large aircraft pilots experience it very seldom, not even in the sim.
You are incorrect that action led to a “massive control displacement.”
There has been an (still unexplained) rudder deflection, not large in numbers but still quite massive at cruise speed, which made things significantly worse.