That's how some people feel about airplanes. Presumably you're not one of them. For some people, the inconvenience of being responsible for a car would outweigh the benefit of setting up their stuff inside of one.
It's not even an inconvenience. I like my cars. Dealing with ride hailing services (autonomous or not) is certainly far more inconvenient than owning a car (unless maybe you're stuck living somewhere without convenient parking).