How is it any more idiotic than maintaining that speed manually? I'm struggling to think of any combination of hardware/software that isn't asinine on first gl

How is it any more idiotic than maintaining that speed manually? I'm struggling to think of any combination of hardware/software that isn't asinine on first glance (e.g. feed the cruise control off only the rear wheel speed sensors on a FWD vehicle) where cruise control would be any different than a driver manually holding the same speed by putting their foot on the gas.