I’ve lived up and down the peninsula and haven’t relied on a car in 10 years. Thanks to a mix of choosing strategic locations, biking, BART, Caltrain, Lyft, Zipcar / Getaround, and friends with cars. Anecdotal, I know, but just chiming in to say it’s definitely possible.
It's possible everywhere. The last two places I lived in St. Louis had Walk Scores in the 90s. If you prioritize it, you can get it. (But obviously some places have a lot more of it than others.)
Not everywhere. I live a whopping 30 minutes from the city line and no uber, no bus, no train, etc. There is a local who will drive you to the airport, and thats it. You overgeneralizing city centric viewpoint is not applicable to MOST of the world. We still need cars, and gas ones at that. Hell, I am one of the few with ACCESS to "high speed" (1.2mb) internet. I am on a major highway, not some obscure hole either.
By "everywhere" I meant "in at least one neighborhood in every major U.S. metro." I did not say (or mean to say) that it's possible anywhere in every U.S. metro, just that it's possible somewhere in every U.S. metro.
(I mentioned my experiences with high Walk Scores in St. Louis to imply that they are anomalous in the St. Louis metro, but that dense, walkable neighborhoods exist even in such car-centric MSAs.)