but those who do not have sufficient understanding of the increasingly complex aircraft systems. In particular, the flow on effects and consequences when a part of that system fails.
They may well have plenty of understanding but in today's environment the crew simply follow what the QRH or recall says to do. They have to, there is no choice. When multiple failures occur the crucial aspect is determining the root cause. I have been with crew in the sim that announced a generator failure, the actual failure was an engine failure, inability to sort the wheat from the chaff will kill people. Knowing WHICH QRH item or recall to do first is important,