I recall observing the FO taxing out towards 08R in EGKK many moons ago. We were in an orderly queue for departure. Right at the end of the concrete the FO continued straight ahead towards the grass and it was a reflex action of mine to brake and stop the aircraft. The reason for the departure from the yellow line? “That’s what everyone does in Gatwick to avoid jet blasting the following aircraft.”
Normalisation of deviance is ten thousand times slower than hypoxia but a thousand times more lethal. Why; because by it’s very nature; it happens daily and it’s incipient.
It’s always perfectly fine until it’s violently not.