The general population wants lower health insurance premiums, lower out-of-pocket costs and larger (or no) provider networks for their health plan. Presumably they also want freedom of choice, no rationing, no long waits for care and as much “free” care as possible because as we all know health care is still unaffordable.
To have lower premiums you must have lower claim costs.
To have lower claim costs, you must have either less health care received, less expensive health care received or higher out-of-pocket costs when health care is received.
To have lower costs for the care received you must pay less for each unit of care received and to achieve that you must be able to negotiate lower fees from health care providers which means you need greater leverage through tighter, smaller networks so a larger number of patients can be delivered to a few number of providers.
The problem is not insurance companies or profits or even administrative costs. If you could eliminate all of that, you would only cut costs modestly and temporarily as the largest component by far, health care itself, continued to rise. This is true under any model of payment, even a Medicare for all scheme. And by the way, government managing care and setting fees that must be accepted has another set of consequences.
If you think politicians can change this formula without serious consequences, you are wrong.