I don't think he meant doing it was an easy task, but rather that a large majority of the time when you take your car you go on a route you've already taken in

I don't think he meant doing it was an easy task, but rather that a large majority of the time when you take your car you go on a route you've already taken in the past, and if the car can self train its routes when in manual mode then you only need to drive it once / the first few times to go to work/groceries/school/...