Test Pilot
A few misguided comments about test pilot territory.
From what I have heard liner test pilots say when they test the edge of the envelope it is in a highly controlled and low energy way. The goal is to keep control and have the ability to return to the envelope quickly.
These guys pushed aggressively through the envelope to the point of invalidating (breaking) the stall warning. The pilots took AF447 it beyond normal test conditions.
AF need to address why all 3 pilots with their training would not mention "stall" or "décrochage". All 3 pilots could hear it. I don't think Airbus and BEA would have that answer.