Don't start this. Aerosoft has repeatedly explained that the REAL A319/320/321 family have barely detectable wingflex on the scale of the real aircraft. It's not in the AS Airbus because it's not there in real life, not because they can't add it.
By the way, while "Sully" is fine entertainment, it's Hollywood. There's plenty of inaccuracies if you half look. For one, how long they wait in the opening takeoff sequence to raise the gear as seen from the external view. That's just in the first few minutes.
Thread closed to avoid flame wars or worse.