I agree with a good chunk of this. I've been in LA over 20 years now. About 10 years in, you're no longer a true New Yorker in the sense that when you go back and visit the city, you don't get why everyone has to be in such a rush and seemingly rude. Like, chill out everyone. That said at 10 years, the LA vibe still feels very fake.
Having been out here and now in my mid-40s with a family, the experience is vastly different. When I was single, the lack of deeper connections was a very real thing. Back then, to me, east coast people were tough on the outside, very warm and loyal once you got past that. And West coasters seemed very nice on the surface, but once you got passed that, there wasn't always anything there. And that was deeply frustrating.
Now that i have a family and live in a neighborhood with other families, things feel far more communal. And certainly the pandemic actually fostered more of a community feel. I have a bunch of friends now where being there for each other is a constant. The sense of comradarie and warmth does exist in LA and elsewhere in Cali, but it takes a long time to find. And that does suck. But on the other hand, you can spend an extra 10-15 years constantly rediscovering yourself. Whether that's related to career, being creative, exploring foods, culture and travel and just so much. And once you've gone through enough phases, you come out feeling wiser for it. And more empathetic because you've tried on a lot of shoes.
But that all comes with a downside. Often a bit too much focus on the self.
I often have fantasies of living elsewhere though. But not necessarily moving back to the east coast. Many of my friends are international. (another plus of living in LA -- the world really can open up to you). And because of that, I think I wouldn't mind living in a totally different culture all together for a while.
Lastly, I've been to a lot of really beautiful places around the world and very little beats the coastline of Big Sur. Just gorgeous. And kinda chilly. Which I love.