Someone in the FAA needs to dig out "Handling the Big Jets" by DP Davis, test pilot with the British Air Registration Board in the 1950's and read page 137 and the diagrams on 138 and 9.
The BAC 1-11 ended up with 4 AOA indicators, 2 on each side that operated a stick shaker and stick push to keep it out of a deep stall. Why is the Max restricted to 2 AOA's?