Originally Posted by
SteinarN
One easy explanation to your question #1 is that Boeing discovered this only in flight testing (at least how serious it was) and there simply was no time to make it much better, nevermind redesigning parts of the aircraft, like the size of the elevator surfaces which probably would have cost one or two years additional delay.
But that doesn't explain why the system wasn't (a) briefed to the end users, and (b) built with the necessary redundancy...