In 2017, we spent $3.5 trillion on healthcare, accounting for 18% of GDP. That's roughly $10,700 per person. Roughly twice as much what other industrialized nations spend. These analyses are basically saying that at a system level, it costs the same as the current system. Hardly earth-shattering data here. Would you be shifting the funding mechanism to taxes? ABSOLUTELY. This is an insanely hard sell politically. But I don't think it's an intellectually honest debate to point out how much the "new" system costs while ignoring how much the current one costs. Of course there's going to be winners and losers, that's unavoidable with systemic change to 18% of the economy. That doesn't mean it can't be the better long term play.
Imagine the reverse. Going form MFA to a system where corporations funded a huge chunk of private insurance plans and arguing against it because "it's effectively a giant tax on corporate America. Now you're going to let Google and Facebook decide who your Dr is. What if you work for Google, but their new private plan doesn't include your doctor?"
I personally think there's a huge benefit by severing the ties to employment. I want a working professional with a family to have the courage to quit his job and start a company without the weight of health insurance being the anchor that ties him to that 9-5 job. I think this would be a huge win for non-healthcare corporations and entrepreneurship.