That might be the ultimate answer to why the accidents did happen. That while pilots should be well trained to deal with runaway stabilizers, they didn't recognize the situation in time (which probably was extremely short with the second crash). Which can only be explained that the way the events unfolded, distracted the pilots from dealing with a runaway stabilizer. The third man might just have not been "distracted" by piloting the airplane and thus could see it.
Besides obviously making the sensors used by MCAS truely redundant and limiting its extreme behavior of moving the trim up to the stops, a large part of fixing the MAX might be just having a big warning light for MCAS operating.
Besides obviously making the sensors used by MCAS truely redundant and limiting its extreme behavior of moving the trim up to the stops, a large part of fixing the MAX might be just having a big warning light for MCAS operating.