Singapore is a city-state made up of two+ etnicities, what worked for them probably wouldnt scale to something more complex as a big & diverse nation like U.S.A
The USA, the most unique country on earth. Solutions that work all over the world can't possibly work here because we're big, or diverse, or X, or Y or Z?
Whether it's healthcare in general, mental health, mass transit, polarization of politics (I think about growing up in Australia where you could be on differing sides of the spectrum and have discussion or debate and still go for a drink together. Moving to the US, I see regularly "I'd rather be dead than be caught having a liberal as a friend" or similar), internet access, or any other thing, the whole "The US is just too different from the rest of the world for any solution to work here that we don't invent ourselves (and won't because we hate upsetting the status quo)."
If Singapore were in the U.S. it would be the second largest city by population.
Singapore has four national languages. It is very diverse.
To take homelessness as an example, police in Singapore can force you to go to a shelter, which is one reason why you don’t see homeless people everywhere. But they also have shelters with space. Many US cities don’t have space for their homeless population. The waiting list is years long.