I work on instrumentation and control systems.
Instrument failure has always been a problem for humans, and even more of a problem for automation systems.
This is nothing new.
So, to fix things, you make them more complicated.
But more complicated means you are introducing even more failure points.
Ah statistics, my old nemesis! By making something more complicated you reduce the chance that the entire things will fail, but increase the chance that one thing will fail.
The military fights this all the time. Old tech would often break down leaving the vehicle inoperable, but it was fairly easy to repair, and so long as nothing was wrong, it was 100% operational. New vehicles, are seldom at 100% operational capability, but nearly all of them are operating at some level of capability.
So, when the brass is telling you that your whatever needs to be at XX% operational capacity, what does that mean?