I never understand how people point to existing systems that are working for a country, and then make the (valid) point that the success of those policies can't necessarily be extrapolated to another country, but then (invalidly) believe that is a suficient statement to end the conversation.
Especially because those people often are talking about countries with some form of democratic socialism (where there are a number of strong success cases), and instead frequently put forward libertarianism - which is a completely untested government form in any country.
Switzerland sustains itself with a huge influx of foreign money by adopting policies attractive to the wealthy. That strategy can't be pursued by every nation on the planet.
Especially because those people often are talking about countries with some form of democratic socialism (where there are a number of strong success cases), and instead frequently put forward libertarianism - which is a completely untested government form in any country.