My impression is a lot of US health care problems are caused in part by a sort of unholy combination of restricted competition and access, together with profit driven market participants.

That is not wrong, literally stated. But know a lot of hn people imagine that this means making things completely unregulated might be one reasonable alternative. The obvious problem in this case is scams and unsafely/deadly treatments. Here, one can point countries with functioning, lightly regulated systems. The problem is that these countries depend on cultural and institutional factors keeping people honest, keeping fake medicine at bay, and etc.

But the US has a cultural of religious irrationality coupled with huge, profitable and predatory organizations (the ones soaking health care dollars as well as alternative medicine cults and scammers). Before the last hundred years of regulation, 1910 or so, unregulated US medicine was a deadly, heroin soaked shit show and if you back to that, all the "alternative" scammers along with Stackler types are ready to jump in to try to equal that situation.