Uber barely operates in huge swaths of the US. I've been in parts of Idaho and Kansas where wait times during the day can be a half an hour and after a certain hour no drivers are available at all. And the drivers who operate in these areas tend to be far less experienced/professional than in denser areas (to put it politely). Waymo solves all of this with just a handful of cars in each county.

Bainbridge Island (connected to Seattle by ferry) is like this. There is approximately one Uber driver, at least the last time I was there, and good luck if you get back to the island later in the day. A single Waymo would be amazing.