What amazes me about Waymo is how expensive the rides are. They're at least 20% more expensive than Uber (the much more expensive Uber of today, not the Uber of 2-4 years ago), sometimes 100-150% more expensive. If they can't be cheaper, then what's the point?
Waymos are 100% reliable. If you book it and it says it's coming at X time, it will definitely actually show up at X time. No more of, driver cancelled at the last minute because they don't actually want to drive to destination Y but Uber etc gave it to them anyways and they get dinged if they just cancel instead of claiming not to be able to find the rider etc. Or driver got lost or stopped for food or gas or something so is late.
It also gets to the destination exactly when it says it will. No weird routes because of the driver's whim or driving too fast or too slow. And no chance of bad music, loud conversation in some foreign language, annoying commentary, etc.
And I want them to be profitable to run too, so they have plenty of incentive to expand the program.