Thanks MFS, FCEng.
Thus as I understand this ‘commonly used’ architecture provides ‘fail safe’ stick-shaker operation at the expense of an erroneous high AoA input, which I assume is part of the high reliability requirement - AoA inputs have to be robust.
It is this rare failure case which enters the debate on MCAS, and use of AoA in other systems.
If other systems drills are predicated on the same architecture of ‘no immediate effect for stick-shake’ (low reading AoA), there may still be many other disagreement alerts and system consequences.