Part of the problem for the US is that such a huge amount of gdp is buried in the masses of beauracracy that makes up the US healthcare system, it’s essentially acting (economically) as proxy government spending to prop up a failing economy. The average US citizen is so heavily propaganda’d into hating government run projects that the sensible economic stimulus (government infrastructure projects or public services) are well and truly off the table.

What this ultimately means is fixing healthcare isn’t just breaking up the cartels, preventing price fixing and untangling the web of nonsense that makes up the US private system… unless you want to inspire a massive crash (which absolutely has real human cost), it also means redistributing government spending and implementing (unrelated) government run services and/or projects to keep all these people employed (which would also mean re-training and potentially relocating) - all of which needs to be done against the overwhelmingly loud voices screeching “government employee bad”.