Lets not get too deep into the helpfulness of stick shakers.
There is some unique combinations at play in this accident
For starters its at high altitude and preceded by speed drop outs.
My feeling is that if only the stick shaker had annunciated, the crew would likely have addressed that bit somewhat better. But when multiple annunciations are alerted the tendancy of some might be to go to lowest common denominator in their memory bank ( and forget about the stick shaker or auto-something disconect)
I've seen this happen before