Stall
I don't buy the argument about blaming the accident on the SW system. The crew ignored it more than 50 times in a row. Why would they suddenly start taking heed of it? And any pilot knows that pulling your nose up will only exacerbate a stall.
I doubt anyone envisaged a pilot pulling up so far into a stall that the airspeeds would make the SW system unreliable. The only way in which I can fault the design of the aircraft in this accident is that it didn't force the nose down in response to the repeated attempts by the co-pilot to pull up. That could have possibly prevented the accident. But also opens a whole new can of worms at the same time.