> Contrast this with a no-rebate world with cheaper/more transparent pricing. Fewer patients would hit their out of pocket maximum.

And premiums would go up. Every insurer has to get their premium approved by every state’s insurance regulator, and every state’s insurance regulator is not going to allow them to have more than a few percent of profit.

> They can use the rebates they get from the providers to subsidize the insured, allowing them to offer lower premiums and gain market share. This is what people mean when they say "In America, the sick people pay to subsidize the health care of the healthy people".

I’ve never heard of this, and it’s legally not allowed. The ACA mandates insurers price plans so that old people only pay at most 3x what young people pay. And the ACA does not allow insurers to charge more to people likelier to need healthcare. Mathematically, that means younger and healthier people pay higher premiums so that older and sicker people can have lower premiums.

NY state goes even further and says all ages pay the same premium, so young subsidizes old even more. MA has a 2x cap, I believe. And then of course, FICA taxes mean the young and working are paying for the healthcare for the old and non working, the vast majority of all healthcare spend in the US (Medicare).