It's always been legal not to have insurance (though there was a brief period where externalizing costs that way was taxed). You can pay cash for health care as you like now with any provider who cares to negotiate with you on a cash basis. There's even a variety of non-MD providers whose licensure ranges from more accessible through informal to non-existent should you object to credentials as distorting.

If you try doing health care this way for long enough, you might even discover which incentives are poorly aligned without collective policy of some kind, but who knows, maybe not.