These systems on large aircraft are quite complex but offer large resources of failure mitigation, which is why this apparently serious failure is important. Cheers
Thinking about this some more, I bet when the full story is out inaction or inappropriate action by the crew contributed to the severity of this situation, like for instance the LOT 767 gear up. The 777 is a very mature design so I find it hard to believe that there is a fail mode that can kill everything.
There does appear to be a trend to minimizing the importance of system knowledge in modern training systems.
in any case however the crew got to a dark cockpit, they still did a very good job of getting the airplane on the ground with negligible damage.