The industry is pretty homogeneous and somewhat of a revolving door between the few OEMs. What are the odds that the code on this plane is orders of magnitude worse (in terms of code quality) than every other similar bit of code in the sky?
Edit. I should have to say this but I'm not defending Boeing here. I'm saying it's not at al unforeseeable that the other planes, even ones by other manufacturers are just as bad. Clearly they thought nothing was abnormal about this one until it started falling out of the sky. I see this kind of like diesel-gate. If one of them is cheating they're probably all cheating.
Edit. I should have to say this but I'm not defending Boeing here. I'm saying it's not at al unforeseeable that the other planes, even ones by other manufacturers are just as bad. Clearly they thought nothing was abnormal about this one until it started falling out of the sky. I see this kind of like diesel-gate. If one of them is cheating they're probably all cheating.