Earlier quoted context omitted.
You can move to Singapore, if you want a better healthcare sector. (The UK spends very roughly half of what the US spends on healthcare in terms of percentage of GDP. That's total (public plus private) expenditure. Singapore spends very roughtly half of what the UK spends by the same measure. Health outcomes amongst the three countries are comparable. If anything, Singapore is healthier.)
Singapore numbers ignore their underclass, which is significant. But you're right, if you're a westerner, Singapore's great.
But yes, I agree that the US should let in more migrant workers. Good for the workers and good for the target country: cheap infrastructure is great!