Will;
You are asking a fundamental design-philosophy which took if I recall ET's story-telling took many years for Airbus to develop. It's available in a paper he wrote (if I recall), entitled "Why we designed them like we did".
What you are essentially asking is, "why isn't there an autopilot system which can fly an airliner in every possibly-conceivable flight regime?"
The A330 autopilot disconnects at 45deg bank angle, 25deg pitch up, 13deg pitch down. The autoflight system reverts to alternate law (and cannot be recovered to normal law) in bank angles greater than 125deg.
In any airplane, it is unreasonable for a designer to not expect that a trained flight crew can take over the aircraft with sufficient competency to fly/land safely. If that is not the case, we are clearly into a very different zone of autoflight development which has yet to be fleshed out.
I don't think you understand fbw very well.
Last edited by PJ2; 16th June 2009 at 16:37.