It works, though. Would a candidate win if they paraded their "big city" values?
It sure didn't for Al Smith in '28.
But most East Coast cities market themselves as being "tough" and "hard", so it stands to reason that running on urban East Coast values puts voters off.
For ex., New York City, from the 1850s onwards, has presented itself as mean and gritty: "If you make it here, you can make it anywhere" - - implying that if you fail in NY, then you're a hayseed loser who should have never left the vegetable patch.
Not to mention the typical Northeastern urban attitude: "If you don't like it, then go suck it (or "f* off", or "eat sh*", etc.)"
I can't think of a faster way for a politician to lose an election than to treat his electorate in the way a New Yorker (or Philadelphian, or Newark-ian) treats non-natives, and themselves.