Removing the need for every household to have their own dedicated car is part of Tesla's vision. Elon has referred to self-driving functionality as a "shared electric autonomy".
https://electrek.co/2018/10/25/tesla-network-elon-musk-compe...
https://electrek.co/2018/10/25/tesla-network-elon-musk-compe...
Some problems I had were that sometimes the car wasn't where it was supposed to be, a couple of times the car was double booked, and quite often the cars had other people's rubbish in them. One time the car was full of sand (clearly someone had been to the beach).
I think in my case I'd always prefer to have my own car.
These are not things that Elon will ever personally experience.
Obviously, it's difficult to square that theory with the "Public transit won't work in America as the population density is too low" line of thought so you probably have to choose one or the other.
[1] https://www.alamy.com/stock-photo-busy-street-scene-in-city-...