I've lived in many US cities, including SF, and your characterization rings hollow for me. Unless you're focusing exclusively on climate, SF without a car isn't all that much better than dozens of other cities. Notably, unless you live near a BART stop, most transit commutes are going to involve some bus, switching to a separate system, 30+ minutes daily commute, $12+ round trip, etc. Or paying for rideshares. Dozens of cities in the US have the equivalent or better, without all the other associated baggage of SF. Here are a few examples I've lived or spent significant time in:
- Chicago, IL: The L reaches a lot more neighborhoods, is a single integrated transit system.
- Columbus, OH: Great bike lanes and dedicated paths, bus system that covers the entire city.
- New York, NY: By far the most walkable city in the US.
- Philadelphia, PA: Decent subway system, good connection to NJ and NY via NJ Transit. Very walkable core and neighborhoods.
- Washington, DC: Far superior version of BART with a lot more coverage.
Unless I've just happened across a half dozen of the best cities in the US, SF isn't all that remarkable.