The Nav/FE fire brigade
My father is former USAF. There have been abundant opportunities for me to meet and chat with other old-school, now-retired USAF flight crew at various events.
From the former members of USAF's heavy, multiengine, multicrew jets, I have heard many stories about potentially serious fires in or near the flight deck -- fires which had been located and safely extinguished as a result of the immediate attention brought to bear on the fire by either a navigator or a flight engineer.
Considerable design time has been lavished on carefully automating all of the official, routine duties of navigators and flight engineers. However, this can easily blind designers to the fact that there were many unofficial, non-routine exertions often carried out by such members of the crew, especially under emergency circumstances, and these are unlikely to be addressed by even superbly foresighted automation.