People leaving to do their own startups would be a pretty small portion of the job market, even on the SF Bay area.
The real problem, IMO, is that workers in the tech industry have voluntarily destroyed these agglomeration benefits by using the short period of power workers had during/after the pandemic to insist on work from home instead of better worker protections.
As a result, it’s very possible that high productivity areas in the U.S. are no longer that, and remote work has reduced all Americana’s productivity, making it impossible to justify the higher cost of living and salaries in big cities.
But it was hot. My time back in coastal California has been mostly in the 70s. Camping in Marin County this week, the high was in the 60s. Refreshing after heat warnings in Nebraska, Illinois and Ontario.
I do agree there is no winter in the SF bay though. That’s pretty nice.
100 degrees is unusual although it happens. I never lived in the South Bay so can't speak about AC. My house, built in 1947, didn't have it. It was a pain, maybe 2 weeks of the year, at most. It was in the 50s, most days of the year. Low at night in the summer, high in the winter.
I had early guidance that the climate was mild and I would live in a smaller house than I was used to but I would be outside all year. Check.
I didn't understand that there are only two seasons: spring when it rained sometimes and summer when it didn't rain but might be foggy in the morning.
My first year, I craved the rain after six months without. I've adjusted although the first seasonal rain is enjoyable like the first snow in the Midwest. But I don't miss the next 6 months of Midwest winter.