Simple. Not having a driver in the car. The driver is the only part of Uber I don't like. I feel like if I make them wait 20 seconds they could ding my rating. If I have kids with me, I hate having to get their carseat buckled, knowing the driver probably doesn't want kids in their car anyway. I hate the awkward silence. I hate listening to their shitty music. At no fault of their own, they are the only weak link in the Uber chain. Everything gets better for me if there just isn't a person waiting on me the whole time.

I'd sell my cars in a heartbeat if "Uber minus the driver" existed and was cheaper than owning a car.

Cost, accessibility, convenience, reliability, safety. You can get all of that with a human driver too, if you're rich.

I have to pay to store my manually-driven car 90% of the day, because there's nothing else it could be doing while it waits for me.

A driverless car can very easily do things and make money while I'm waiting for it.

In some scenarios, people rent out their owned cars during the day to avoid this massive opportunity cost, but I doubt that will be the most efficient model.

In what other asset class ever has it made sense for the capital owners to be an extremely long tail of people, rather than a large corporate owner? Especially something as high velocity and fungible as cars.

In a few ways, no.

Taxis/uber etc. are all built as "regular cards". It requires at least 2 people in there. How often is actually more than 1 person in a car? Wasn't that like 2/3 of all drives?

Now let's assume we have specialized cars for just a single person - that saves a lot of material, fuel, and also (parking) space.

But that only works if you don't OWN the car, because if you own it, you might sometimes have to have passengers right? So you always get a big car that is not needed in 2/3 or so of the drives.

That aside, having another driver is annoying for various reasons (e.g. privacy).