It's annoying that NYC is usually stereotypically associated with Wall Street. I think there should be more technological companies in NY.
New Yorkers take pride in their reputation for toughness. New York is about projecting strength. New York is about old money. Tech people, not in all cases but I believe the majority, take pride in their intelligence, ingenuity and adaptability.
The west coast is about doing things your own way. The west coast is about not being afraid to be different. The west coast has a reputation, deservedly or not, for embracing unique individuals and that appeals more to tech people than New York's toughness.
New York just feels like the past to me; the old world where with old money where I'm likely to find people with generic backgrounds.
The West Coast is pushing the world forward, and I feel like I'm more likely to find people with the variety of backgrounds necessary to make a start-up successful.
> New York tells you, above all: you should make more money.
That's very true, but ironically not in the sense that the author meant it. New York is just annoyingly expensive city in the real estate sense. So living in New York directly tells you "you need more money to pay your rent / pay off your mortgage, etc".