Machinbird
The stall warning is one of the highest priority warnings in any aircraft. It deserves its own mode of communication. There is another part of aircrew anatomy that is available for receiving the message of a vibrating stall warning effector, the part that they sit on. By vibrating the seat bottom, the crew could receive a stall warning message through a tactile mode of sensing and not add to the cockpit uproar.
CONF iture
And I don't put too much expectation in the BEA to dig any further in that direction
There is also a technical reason for this: Technically speaking i´m not sure it would be possible to go deep by lack of data (recorded information). During the critical phase: The AS was lost (simply was not measured properly, despite the "redundancy"), and the mysterious WRG failure could also be impossible to be "understood" by lack of enough information to perform the analysis.