I don’t understand the American obsession with designing new systems yourselves when there’s already plenty of alternatives out there that have been tried and t

I don’t understand the American obsession with designing new systems yourselves when there’s already plenty of alternatives out there that have been tried and true for generations. Health care that’s affordable, offers longer life expectancy, costs less as a percentage of GDP and available to even the poorest citizens have already been implemented in countries across the globe, in Europe and East Asia in particular but also in Canada and Australia. Why is it that if a US politician says ”our system is bad, the system from France/Germany/UK/Sweden/Japan is beating us in almost every metric, let’s switch” is met with boos but someone who says ”I have an completely untested idea that’s our old system with some quirks that looks like it was designed by a committee without a vision, let’s try it” is met with cheers?