You need to go back to ground school. Flight controls move on bearings ..which require a special low-temperature (mfr’r specified) grease…regardless of which system (wire-rope/hydraulics/electrics) tells them to move.I
I have literally burned MILLIONS of gallons of jet fuel, and have never used even an ounce of "mo gas" in an airplane!
Fly by wire controls do not use grease!