Ergonomics? He had plenty of hours to get familiar with all such 'Gotcha's'.
Too many opportunities for the pilot to intervene were not acted upon. Tired perhaps? or just been doing it for so many years that this one night he somehow just couldn't been bothered (oh look a light has come on... there's another one... whatever, I'm just so bored with this s**t).
I think that this incident, and the other recent 'mystery' accidents should prompt us at this stage to be thinking about an element of psychological review of the flightcrew in addition to the AAIB investigation. People go through a lot in life, at diifferent life stages, sometimes quite low for no obvious reaasons.
Flug