Dunno how 'Medicare for all' will work out if you simply start paying providers what Medicare currently pays. Dictating a price might work in the long run but would be plenty hairy in the short.
I can sympathize with the on-the-ground employees but the businesses they're keeping the lights on in are leeches on the healthcare market - I posted separately on this article going into the specific functions of PBMs, Pharmaceutical Manufacturers, Providers and Insurers if you're curious about the details, but there is a ton of inefficiency here.