Fascinatingly, every argument you make is wrong.
> it cost twice as much as an Uber
Surely incidental since the typical price per ride is about the same. Generally though, the relationship between the cost to operate a service profitably and the price presented to the user is very complex, so just because the price happens to be x right now doesn't tell you much. For example, something like 30% of the price of an iPhone is markup.
> while having a longer wait time for a car
Obviously incidental?
> It also couldn’t operate on the highway so the transit time was nearly double.
Obviously easily fixable?
> One shouldn’t underestimate how economical real human operators are.
There's nothing to underestimate, human drivers don't scale the way software drivers do. It doesn't matter how little humans cost, they are competing with software that can be copied for free.
> Waymo can’t share the business expense of their vehicles with their employees
They can share parking space, cleaning services, maintenance, parts for repair, etc.
> I’m sure it’ll improve but this tells me that Waymo’s price per vehicle including all the R&D expenses must be astronomical.
Obviously, they're in the development phase. None of this matters long term.
> They are burning $2 billion a year at the current rate even though they have revenue service.
"The stock market went up 2% yesterday so it will go up 2% today too and every day after that."
> Plus, they actually have a lot of human operators to correct issues and talk to police and things like that.
Said operators are shared between all vehicles and their number will go down over time as the driving software improves.
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To sum up, every single part of what Waymo is trying to do scales. Every problem you've mentioned is either incidental or a one-off cost long term.