Milton Friedman is an economist and clearly had little understanding of health care - he regards the reduction in occupied beds by 11% over a given time period as an example of inefficiency - it is the exact opposite. He does make a couple of good points - once you have nationalised a system you cannot nationalise it again, so any gain in votes is only temporary, and nationalised systems do tend to do a lot of what they shouldn't - the NHS does a lot that Social Services and indeed the public should be doing.
The current winter crisis is the worst since at least 1980, when I started to work in the NHS. I am so thankful I am retired, but that does not help those at the coal face. Stay away from A+E if you can, and from others if you/they have a transmissible infection. One of the main reasons for the annual winter pressures is the bug mixing festival we call xmas.
Any international comparison chart you care to look at shows that the NHS is under staffed/bedded/financed, despite which it gets surprisingly good outcomes. If it did not have to act as the fall back solution/safety net for social service failures/omissions/delays it would do rather better, but no government dares to grasp that nettle.