The sheer amount of overhead induced by insurance is staggering. For example, the sum of the net profits of all insurers represents money extracted from the system without contributing to health. And the amount of time doctors spend documenting patient care over and above what’s medically necessary purely to make insurers happy is time not spent seeing patients. Clinic staff spending hours on the phone each day arguing against denials is wasted money. (Anecdote: an insurer refused to authorize an MRI for a patient until my wife xrayed their damaged tendon, which doesn’t show up on xrays. She had to conduct a useless medical procedure on the patient before they’d pay for one with actual diagnostic value.)
The whole overhead imposed by the useless rent seekers is money not spent on making people healthier.