You hear this same sort of argument with the adoption of any new technology. I imagine that when Flight Navigators started disappearing from flight crews in th

You hear this same sort of argument with the adoption of any new technology. I imagine that when Flight Navigators started disappearing from flight crews in the 1970s with the advent of GPS and other related electronic navigation systems, there were those saying "I'd never leave the ground without a flight navigator - what if the GPS stops working?!?" Should we keep an old school Flight Navigator on standby "just in case"? I remember talking to an retired mechanic about 20 years ago, who told me he never did a road trip without taking all his tools with him so he'd be ready to fix anything on the side of the road if need be. I wonder if he is still doing that....I doubt it. As technology gets better and better, the "Number Needed to Harm"[1] needs to be considered. [1]https://en.wikipedia.org/wiki/Number_needed_to_harm https://en.wikipedia.org/wiki/Number_needed_to_harm edit: missing word