Actually, I think Australia’s Medicare system works well - about the only socialist idea I’ve ever seen that does. I think it works because Australians also have the choice of private care alongside if they want it and are willing to pay (or have insurance).
The problem is that Americans wouldn't stand for the long waits for things like knee and hip surgery, that Aussies who do not have the private insurance have to endure.
What the left in America wants is fast service and free pharmaceuticals, but I don't see how they can pay for it. For a starter, they would have to get rid of trial lawyers, (which don't exist to the extent in the countries that have government medical systems) and they are a big supporter of the Democrats. So if they go to a truly universal health system that doesn't ration health care (and all of the government countries do that), they will never be able to afford it without significantly raising taxes to a rate that is unsustainable.