I can tell a lot of y'all don't know what Chinatown really is.
You really think they're living it up by selling each other Chow Mein?
That's like you selling the neighbor some ribs, and them selling you some potato salad back, and between the 2 of y'all you can buy 2 mansions, a yacht, and a Hellcat.
The traditional pillar of Chinatown is MANUFACTURING. In this case, garment making.
That's how they employ local Asians and legal/illegal immigrants. That's where the bulk of the money comes from and then gets circulated down through all the retail businesses that make up "Chinatown". (And as manufacturing has dried up, they have had problems in getting similar work - much like the rest of the world)
Chinatown historically makes and sell clothes to rest of the country/world, and those wages and profits go into their retail businesses, but also real estate and banking. A lot of NYC is full of Chinese people at sewing machines. A lot of Fashion Week is courtesy of Chun and Bruce Lee.
The Asians that grow up here, usually can't work the same jobs their parents did. You might catch a few that run the family bakery, maybe update it with some internet stuff - but food is a low profit margin business. It always has been. Lotta people know how to make a good sandwich.
Hence the 2nd generation gets into Medicine and STEM.
So if you want a "Little Harlem" - you need a thousands, tens of thousands, hundreds of thousands of Black people, in your area making something that sells to the world. Not a collection of Shea Butter retail spots and artisanal wing tips with Unc's hot sauce.