My daughter and her family emigrated to the USA and have top of the range health insurance. Even so, there's always a bill to pay for any medical procedure, however small. They have also found the system quite difficult to navigate, as they can only go to doctors, dentists, hospitals, etc, that are specified by their insurers.
Four years ago, I was extremely ill in hospital and the doctors had to try several different drugs to try to stabilise my heart. My daughter said later that, if I had been in the USA, the doctors would have had to get authorisation from the insurance company before they could try the different drugs.
She had a friend who was dying of breast cancer and there was a drug which would hopefully prolong her life, giving her more time with her young children. The insurance company refused to pay for it. Her husband had to go through a legal battle to get them to authorise it, which they eventually did but the cancer had, of course, got more of a grip by then.
The NHS isn't perfect, by any means. Last year, our other daughter had to have an operation for thyroid cancer and needed another to remove the rest of her thyroid in case it had spread. The waiting list was so long that we ended up paying £6,500 for her to have a private operation, because we were scared for her to have to wait. My daughter in the USA said that her sister wouldn't have had to wait if she lived there - but the operation could have cost ten times as much or even more.
I asked her how people managed if they had no insurance, or if they had a long illness and their insurance ran out. She said that she had no idea, and that she thought they didn't manage. They went bankrupt and often lost their homes.
It horrifies her to see that the UK seems to be sleepwalking towards a USA - style health care system. She says that we don't know what we're losing.