When my wife broke a bone in her ankle and had to have a metal strap placed on the joint we were in New Zealand.  She was covered by New Zealand health care.  A week in the hospital, surgery by a team of orthopedic surgeons came cost free to her.  So I know from experience the claims about national insurance in other countries is completely misrepresented by Americans who have not left the country and had medical care in a foreign location.

Those who think insurance companies in the US simply pay for everything have not had any serious medical issues requiring preapprovals by those companies. Those same individual have not had to deal with the limits on just how much those companies will allow for that care; leaving the rest as out of pocket to the patient or patients family. Should the needed care not meet the insurance companies criteria the entire cost becomes out of pocket.