Agreed, autonomy is a service and not a feature of the car. It has to be. There is inherent cost as you use it and associated liabilities, legal requirements for auditing, technical need for maintenance and dealing with updates in a timely fashion.
You could make the point that owning the car is a lot less important if you don't drive it yourself. If Uber didn't have to pay drivers, they could expand their area of operation to basically everywhere. Drivers need to be paid so having them drive long distance is relatively expensive. That constrains the area of operation. But otherwise, cost per mile is very low. So, orchestrating pickups in the country side becomes possible.
It's going to enable night time travel as well. Nap/sleep while traveling. Wake up at your destination. That's going to revolutionize commutes as well and enable people to live much further away from work. A four hour commute is much less of a problem if you can spend the time working or napping.
That in turn is going to do wonders for real estate prices. Because there are a lot of nice places to live that are currently far away from cities and therefore still relatively affordable. We got a preview of that during the lock downs when people figured out that remote working is a thing.