There's something magical about California and New York (another tech powerhouse).
NYC has this vibe of "getting stuff sone, no BS" kind of mindset. California has this relaxed vibe but at the same time the sky is the limit. I think it has something to do with how the sun shines there and the ocean. You feel like just working and things are going to be OK.
I am always more productive in NYC or LA. And I have no real explanation for that.
NYC and SF have private capital concentrated in enormous quantity. Look to the preceding 5 decades to see how that happened, it did not spring up overnight.