If the US has a culture of people making poor decisions for their own health, exploiting systems for their own benefit, and of government bureaucracies utterly failing to achieve the ends they're supposed to achieve with no accountability (and it does), no amount of tax revenue is going to suddenly provide everyone with world-class healthcare with no concern for their own money.
I'd love to never have to deal with my insurance company again, or take diagnostics or treatments without being able to find out how much I'll have to pay. I really would. I just have zero confidence that any of that would change no matter how much more of my money gets taken by the US government.