Any electronic system on any aircraft should have a means of isolating the power to that system. Even if it is critical. Is the MCAS system so infailable that such a system does not have a CB tied into it to isolate it? I am not rated on 73s but know the basic stall identification and warning systems on other types. One they do not operate until the weight offs + time delay occur and there is simple methods to deactivate.. I smell a massive regulatory and manufacturer fail that should have been apparent with the Lion Air crash. Then again I am a techie, not a system designer.