While that’s true of the outer communities (San Jose, etc) I took the OP’s message as referring to SF core/downtown which was already pretty developed by the 1950s. Unlike LA, SF was a major city far earlier.
Much of SF's core/downtown was rebuilt after the 1906 fire and earthquake, plus there was massive "urban redevelopment" that made the core much more car friendly.
People are forgetting about pasadena. That was the bigger socal city than la for a long time and maybe even bigger than sf (certainly is geographically).
