There is surprisingly poor Vietnamese and Indian food in New York, although that’s slowly changing. But for lots of asian cuisines there’s fantastic diversity and quality.
And most other communities aren't well represented in general. Even Chinese ones, compared to the Bay. Like I think there are only 2 Guilin style restaurants in the NYC area (please correct me if wrong - I'd love recommendations).
For smaller Asian ethnic groups, we are well represented in the Bay Area due to the existing large Asian community (and to a lesser extent in most other West Coast cities)
This isn't a think in NYC. Nor is there convenience. The same way a New Yorker can go downstairs and get a Pizza Slice, I can get a Banh Mi or Jiaozi in SF.
NYC has options, but it's a minority. That's a very real thing - it's a MINORITY. This simply isn't as common an experience in California.
If you're a numerically large ethnic group like Korean or Cantonese it might not matter as much, but it does to us who are from smaller ethnic groups. My ethnic group has only 3 million people at most, and most of them only reside in South and Central Asia with no diaspora.