Which is why even though I support a single payer system, I try to warn people that they should understand that there will be changes they might not like. The cost-benefit analysis will change and so will treatment paths.
I’m not sure it has to be that way. The smartest people I see advocating for single payer in the US suggest we should copy the good parts of single payer systems from other countries and jettison the bad parts. The United States should innovate and make its own best single payer system. We’ll be terribly late to the table, but at least we’ll be playing the best cards.