AIUI 737 MAX has an instability such that, in near stall conditions, some attempts to recover can make the stall worse. To mitigate this, Boeing added MCAS, and MCAS can malfunction with a single sensor failure. Imagine that this failure occurs and the pilot successfully turns off MCAS but ends up in a dive, too close to the ground, or otherwise in a bad situation. Now the pilot has to recover, but they are facing a faulty AoA indicator (if they have one at all) as well as a plane that, because MCAS is off, is unstable in near-stall conditions. And the pilot has never been trained in the handling of type 737 MAX under these conditions.
Am I wrong for some reason, or is this a potentially rather dangerous situation that could be caused by a single instrument failure?