That part of the comment was about the second sentence, that if we just assume everything is fine there's no point in the discussion. F-117 instability would be

That part of the comment was about the second sentence, that if we just assume everything is fine there's no point in the discussion. F-117 instability would be a ridiculous level though. That we can safely assume. My conjecture from what I've read so far: - Boeing did a good enough job with the airframe that the plane flies mostly fine but there are no miracles and some specific angle-of-attack and airspeed situations make it fall outside the rules. - To bring the plane back into compliance they implemented a fairly simplistic solution in MCAS. Because the situation that is being fixed was fairly benign they didn't engineer it with triple redundancies. - The lack of redundancy was understood to not be a big issue because the worst possible outcome is runaway trim and that's something pilots already train for anyway. - The MCAS runaway trim presents itself in such a unique way that even experience pilots that are already warned about issues with the plane fail to diagnose it. It's in this context that I would then like to know how unusual this situation is. If modern airliners all have these kinds of issues solved by control software then this is just another failure mode that needs to be fixed. If instead it was indeed unusual to fix the aerodynamic issue with control systems then the discussion about Boeing forcing through with the 737 instead of redesigning becomes more important.