But at the end of the day society has to decide whether or not healthcare for everyone is something worth spending money on. And that's were the US fails imo: no sense of a shared community.
These seems to most often crop up around non-critical issues like joint paints etc.
And i have yet to find a single payer system that do not let you go abroad for elective care, if you can find the funding. They will however not fund your trip unless there is a strong case made for there being no viable alternatives back home.
This in turn bites those that try to pay directly, as they end up with sticker shock.
When my father had cancer treatment, he sometimes asked for the public hospital (shared ward, less lonely when he was feeling OK but had to spend days in a bed) and other times the private hospital (doctors and nurses had more time, but the treatment was the same and he had a private room).