1. The pitot tubes froze (this was already a known possibility) and this particular plane was scheduled to replace those tubes; 2. When the speed metrics became

1. The pitot tubes froze (this was already a known possibility) and this particular plane was scheduled to replace those tubes; 2. When the speed metrics became unreliable, system didn't do anything uncommanded, disengaged autopilot gracefully, notified the pilots and handed control over to them; 3. Stall warnings went off and one of the pilots continued to pull on the stick (this baffled other pilots I heard speak about this too because this is the exact opposite thing to do during a stall) 4. It's clear from their exchanges in the cockpit that this particular pilot was very nervous during the whole thing. What's complicated about that? I can't see how a computerised system could have helped here. Computer had no reliable grounds to make a decision and it did exactly what it should and what should have neen expected by the pilots at the time.