Carby,s etc, have served us well for umpteen yrs, why go and complicate things. "EFI" was in part, to lessen pollution, to increase power etc, we are bound by regulated max weights, and the 80.........120 hp most use, does the job just dandy.
My gyro is "EFI" , prob is, the slightest hiccup, is a nightmare to trace.....and folks can get a head shake from workshops because it,s an aeroplane install, they want nothing to do with it.
Carby,s .....easy as.
As to "limp home mode" if the ecu is not happy with a sensor input, limp home is about 20% power......at best. Yet to see aviation get you home on 20% avail power.
Keep it simple is my preferred.