Terminology.
Since they targeted very low risk, they did a geographically-segmented rollout, starting with Phoenix, which is one of the easiest places to drive: a lot of photons for visibility, very little rain, wide roads.
Since they targeted very low risk, they did a geographically-segmented rollout, starting with Phoenix, which is one of the easiest places to drive: a lot of photons for visibility, very little rain, wide roads.
I think you misunderstood, or it's a terminology problem.
Waymo's point in the video is that in contrast to Tesla, they are _not_ doing gradual rollout of seemingly-working-still-often-catastropically-failing tech.
See e.g. minute 5:33 -> 6:06. They are stating that they are targeting directly the shown upper curve of safety, and that they are not aiming for the "good enough that the average user will stop paying attention, but not actually good enough to be left alone".