DIRECT health care labor costs (doctor's, nurses, etc) are ~40-60% of TOTAL healthcare spending.
Smart people try to figure out ways to make our system better every day. If there was a silver bullet, we'd have already taken it.
Health insurance profits are ~1.2% of total health care spending, the cost of running it is approximately ~4% more.
It's always going to cost SOMETHING to run - whether you move it to the private or public sector is largely a rounding error.
If you take all those insurance jobs and pop them into the Federal Government - you're unlikely to see much efficiency gains (the most pro-medicare articles state it's 37% more efficient - that's an improvement of ~1.5% in total spending).
UHC had a net margin of 6.1% in 2024.
Sure, if all 6.1% of that went to spending instead of profits - health care would be slightly better.
But it's mostly a rounding error. Private health insurance profits are only ~1.2% of total spending.
Maybe you're focused on a ~6.1% margin, or ~$60B in total profits.
You're not going to get substantially better outcomes by simply having ~1.2%-2.7% more money to spend.
You'd need to bring down the actual cost of healthcare substantially - which isn't going to happen unless you pay doctor's and nurses way less money.
Pharmaceuticals are only about 9% of total US healthcare spending - even if you nationalize that (never going to happen) - you're still not getting substantially better / cheaper outcomes.
Profits on pharmaceuticals is <2% of total spending as well.
The only way you're getting significantly cheaper service is by reducing your biggest cost significantly - i.e. paying less for direct patient healthcare (doctor's, nurses, etc), and that's probably not a great strategy for getting better outcomes.
Who knows? NHS pays doctors dirt, and their system isn't obviously worse than ours. Some people think it's way better, others way worse.