Outside of the Military most flight engineers have simply been replaced with a bunch of 00011100011101010111000111's
Don't get me wrong a third person in the cockpit in times of high workload in an emergency can be a bonus, but a lot of FE's seem to think they are indispensible....... clearly the History of Aviation and the little black box has proved them wrong...
Similarly Navs have been replaced with a 50 quid box of 001010101001111001111's bought form the likes of Maplin or Garmin