The question of whether was are overcomplicating our jets isn't just limited to things electrical/electronic. There is also the fuel system. I flew turbine powered planes for years in the 1990's without having a UAT (since they weren't invented yet). Some guys ran regular clunks, some got fancy and used a big felt clunk which worked great. In dozens and dozens and dozens of flights I never had a flame out due to an air bubble.

These days, if you showed up at the field with a jet without a UAT, I think many folks would figure you're nuts.

Regards,

Jim