Miami seems to share enough similarity in warm weather to SF to be a similar enough use case to expand while providing slightly different driving conditions to be able to dip ones toes in to the driving habits of a different city.
I’ve lived and been driving for nearly 15 years in various large cities (SF, ATL, Seattle, Portland, LA, etc.), both cars and motorcycles, and NYC (where i currently live) is the only place in the US I absolutely refuse to ever drive (or ride) in.
Not just because it isn’t as necessary here due to public transit usefulness (which is also true), but also because driving here feels like entering a warzone. Narrow roads and parking, drivers being extremely on the edge and leaving a few cm distance max between each car in traffic, constant honking, having to make very dangerous maneuvers on the daily just to get somewhere, and just the cutthroatness of the whole thing here.
I genuinely believe that NYC will end up being the final frontier for Waymo, after all the other places in the US (aside from those with extreme snow conditions).
Miami sucks because half the people on the roads here don't actually know how to drive.
They are immigrants that come from countries whose roads are effectively lawless, or come from countries that have a severely underdeveloped automobile infrastructure, or come from countries where all that's needed to get a driver's license is to pay someone.
Streets, alleys, etc. are blocked or are narrowed by vehicles and a myriad of other possible obstructions, all of which could be concealing pedestrians.