Depends on where the fab is. I agree if we're talking about rural Arizona, but if the demand is there, I guarantee you that someone will open a franchise (or six) down the street and operate overnight to meet that demand. In and around larger cities though, it's not really a problem. There is usually _something_ open, even if it might not be a long list.

apart from NYC (and maybe Las Vegas), I don't know any other US cities that has functioning food places that operate throughout the night abuduntly

do you have examples?

Are we discounting fast food? I can't speak for everywhere, but in Dallas, many chains are open 24/7. Whataburger is a Texas franchise that has been 24/7 for basically it's entire history in all locations. They are closed for Christmas and Thanksgiving only. McDonalds is 24/7 in most major cities. In Dallas proper, there are some smaller (local) chains that are frequently open until 2 or 3am but admittedly they mostly cater to the bar crowd who wants something to eat before heading home after drinking all night. Café Brazil is a local Denny's/IHOP type diner that is open 24/7 including major holidays!

Your addition of "abundantly" makes things more ambiguous, but I think the choices available in most large US cities is _decent_ after midnight. Can you get absolutely anything like NYC? No, probably, not. But burgers, diners, and fast food are all generally available. That's also ignoring 24/7 grocery stores like Walmart that can fill in the gaps if you're craving something hyper specific. Perhaps you can't buy it ready-made, but you can buy the ingredients!