Well, Nightstop is clear that instruments are far more use than any other means for identifyying threats so we can all abandon our lookout while we bask in the self-righteous knowledge of saving a propaganda supplied figure of 4Kg of fuel per trip.
The company's rung the bell so Capt Pavlov obediently says sod airmanship, it saves fuel.
QED
Personally, I'd prefer to think through the matter...and act accordingly.
Nav lights off too? Cabin light to dim?If not why not?