Even if the self-driving can be implemented only partially it can be a big gain. E.g. suppose the car can only drive itself on highways in daytime in good weat

Even if the self-driving can be implemented only partially it can be a big gain. E.g. suppose the car can only drive itself on highways in daytime in good weather. It still a great convenience feature to have if you don't have to drive for 80-90% of your commute (with the above conditions) and you only have to take over in the city.