I don't disagree with any of the above - even the Last Trip advice !! - but let's not forget that every generation has it's own problems to address, in ways we 'oldies' can only imagine now.
I was once told that I would never make a navigator until I'd been over Berlin with the shells coming through the cockpit as I tried to get 3 different drift readings from the drift sight as the pilot tried to keep the aircraft steady on heading, to assess the wind for the flight home.
I never had to do that.
Later I despaired of my own nav. students wrestling with the sextant, and Grid navigation, over the Pole.
They never had to do that.
Along came INS, and then FMS and now GPS, they don't even have to fight HF radio - do they ? ( Delhi, Delhi, this is Bombay - Shut Up Delhi ! )
I blame Bill Gates, life was easier before computers - even in the shops !!( at least people could do mental arithmetic )