I think Boeing was in a wrong mindset: certification was seen as a burden instead of being seen as an help to build a better aircraft. But maybe it was not only

I think Boeing was in a wrong mindset: certification was seen as a burden instead of being seen as an help to build a better aircraft. But maybe it was not only the fault of Boeing. The certification process of FAA is perhaps not friendly enough toward big air-frame changes (like putting the wings slightly higher to make room for the bigger reactor). Here, the certification process has not identified that a failure of one AOA sensor was able to cause a difficult to avoid crash. Maybe we should allow the use of less reliable source of data (like GPS, ...) each time a sensor has a problem.