FWIW I believe 'drive by wire' is exceedingly rare. The Lexus RZ450e and the Cybertruck are the only vehicles I know of where the steering wheel is not mechanically connected to the wheels.
Oh, that's good to know. Throttles are commonly by-wire, but I must have misinterpreted the move away from hydraulic to electric steering assist as moving from mechanical to signals. Thank you for the correction.