Is it really that easy as you say it? What was then the reason for doing wrong?
You might read in the history of upset and stall recovery procedure development. Since 2004 it changed 2007 and 2009 (after AF447).
upsets and stall
Those changes and developing and refining the procedures and the asociated recommended (unfortunately only recommended) training would not be necessary according to your saying. Did you do stalls and spins in real aircraft or simulator? No, not approach to stalls, real stalls? I did it in real like some others. Itīs a expierience and you dont stay cool when doing it.
If you say the upset should not have happened at all, i might agree. But the recognition and the recovery from stall is some different matter. Two years ago when i mentioned the possibility of stall on this forum, it was rebuked as not possible. Probably AF447 thought as well that it was not possible, by the way also the words of the crew on the CVR.
Not possible? Any failure is possible with humans, also the misjudgement of 3 pilots.