@Dozy: The fact remains that the pilots either didn't believe the stall warning or didn't even perceive it at all. Which caused BEA to recommend (4.2.2)...
... that EASA and the FAA evaluate the relevance of requiring the presence of an angle of attack indicator directly accessible to pilots on board
aeroplanes.
And I'd say that some kind of instrument for PNF to point at and say "tu vas décrocher, tu vois? il faut descendre" would have been a great help.