One of the documentaries I saw about the crash made the point that even if the pilots lost all airspeed indications, there is a specific procedure to follow that will keep the plane in the air without stalling. Something like, apply 85% power and a certain amount of nose-up pitch. And that in several other pitot tube failure incidents, pilots had failed to do this and made the problems much worse than they would have been. (I'm not a pilot so tell me if that's bogus.) So I think there was always going to be a significant amount of pilot contribution to the crash. But it remains to be seen how much other factors contributed, such as the flight control software.