Exactly Vessbot.
Another thing that I think about is that as the systems improve, which they will, the point at which they fail will be further and further into the areas that make the aircraft harder to fly with the system handing over a larger and larger pile of excrement as it progresses, QF32 a possible example.
It seems as if Airbus have tried to engineer pilots out as much as possible, and in doing so have made aircraft that are, in some situations, very much more difficult to fly than they need to be. They have taken a lot of the day-to-day things and automated them and this has had the effect of weakening pilot skills and when it does drop its bundle you'll need those very same now weakened skills to fix it. Every day there are possibly hundreds of events around the world where the automatics go haywire in one form or another, and it's fixed by the pilots, who simply tidy up and continue on their way. If you stopped those fixes, it would start raining aluminium.
There is no such thing as something that cannot fail..... at least not at the moment.