Do you have a reference for this? To my knowledge there was an optional AoA disagree indication (which was on a multi-function display so it's hard to argue it

Do you have a reference for this? To my knowledge there was an optional AoA disagree indication (which was on a multi-function display so it's hard to argue it was any kind of cost saving). It's unlikely this would have been a factor in preventing either accident. A small warning indication with no actionable steps would have been low on the priority list for a pilot wrestling for control of the aircraft.