I realize a fair number of readers here probably live in cities and maybe don't have cars. But, in my case, I live outside a major city and, while in normal times, I do take reserved cars back and forth to the airport, I haven't taken a taxi/Uber/Lyft around where I live for many years. I do take them maybe a dozen times a year but that's when I'm traveling.
So the fact that there's relatively little use of Waymo in the Phoenix suburban sprawl where it operates doesn't seem especially noteworthy.