I've never understood this. I'd like to be surrounded by people that don't all do the same thing as me. I want to meet new and interesting people, not expand the bubble around me. I already interact with everyone at work most of my day, now I have to interact with people that fit that mold even when I'm not working?
Different strokes for different folks, but SF has always felt like a bit of a monoculture to me.
I straddle the communities of tech/startups an the "digital nomad" world, and feel similarly when I go to dense nomad hubs (particularly Chiang Mai).
Too much of one thing gets old really fast.
It's unbelievably annoying after a few years when you're just trying to have dinner with your wife without overhearing someone talking about raising a round at the table next to you.