Single payer may guarantee universal coverage, but it is not the only route to achieving it - there are multiple counter-examples among advanced nations. If your goal is to improve health care and reduce costs, you should consider all options, not just the ones that flatter your ideological biases. That doesn't mean accepting clearly bad-faith arguments like "let's abolish malpractice lawsuits" at face value, but it does mean you have to explain why (for example) Germany's multi-payer health insurance system would be unacceptable for Americans. (Germany is significantly more socialized than the ACA, but significantly less socialized than Warren's current M4A plan. EDIT: or maybe not, as comment below suggests, but it definitely includes private health insurers, which Warren has said she would abolish.)

Germany's multi-payer system has significantly stricter consumer cost controls and Germany in general has more government-run health providers (eg: your out-of-pocket costs are effectively capped at a low % of your household's income). It's a good bit more socialized than Warren's and might, taken as a whole, be more socialized than even Sander's M4A plan.

Perhaps a German HNer can chime in on how frequent medical bankruptcies are in their country.

You used "equivocate" incorrectly. Also, as Kevin Hart says in the 40yo virgin, you're throwing too many terms at me (public option, universal, single payer, progressive) and I'm gonna take it as disrespect.