The reason for lane departure assist ( that’s the one that will be mandatory, not lane keeping on CC) is something else: inadvertent drifting off the lane when

The reason for lane departure assist ( that’s the one that will be mandatory, not lane keeping on CC) is something else: inadvertent drifting off the lane when tired and driving without CC/autopilot/whatever (when you arguably shouldn’t be driving bad should have stopped, but sometimes you can’t, or don’t evaluate your tiredness correctly).