No, it's just demonstrably far better and more efficient than the existing multipayer, non-universal system.
#1: 'It must' according to what/who?
#2: My claim is that the greater the extent of private involvement in healthcare, the more expensive it tends to be, which is borne out by the facts if you care to research them. At the very least, the significantly greater public sector involvement in other developed countries permits vastly more efficient and less ethically dubious healthcare systems than America's.
No it isn't, because your inputs costs are still greater: your drugs cost more, your supplies cost more, your massive administrative spend remains bloated, labour still costs more, and everything that increased participation can have an influence on only has so much margin to decrement costs with by ramping up volumes.
To be honest, I think I'm done repeating myself at this point. If you want to persist in your essentially baseless belief that increasing the purchasing power and market participation of the poor is some magical panacea to the serious problems, including ethical problems, of the American multipayer, for profit healthcare system, you're welcome to do so, but I'm done highlighting, and at this point largely reiterating how this is simply not the case per the numbers and facts as they stand.