My personal view and this applies to both B and A is that they are remiss in allowing ANY alarms, flight director, stickpusher, or any other flight display other than Gyro , heading, thrust in any case of "does not compute", "input out of range" or any other case where the software self check sanity check throws an error. If the computer is not 100% SURE then turn it all off
what this comes down to is that there needs to be a CLEARLY DEFINED REVERSION STATE that is REGULARLY TRAINED AND FLOWN and that in all case of unreliable input the aircraft should revert to this defined and trained for state (without spurious alarms!)