I've said before I don't believe Bernie would be able to pass M4A but I do think he'd negotiate in something much better than Biden would simply because his starting point in negotiations is further left. Biden is starting in the middle and if he gives in on anything we are basically stuck with what we have now. Too many centrists had plans like Biden's and didn't offer anything substantively better than we have now.
Biden was constantly touted as the most electable by nearly every talking head on TV, they don't want the changes people on the left want.
I am not talking about Biden I am talking about every candidate. You can't say every candidate's health care plan was too close to what we have to be able to negotiate. You also aren't going to do a single meaningful thing without winning the Senate which is extremely difficult to do. Bernie makes those races harder because those key candidates can't back fully back Bernie's plans and win. There is a reason Steve Bullock waited until he knew Biden would win to get in the race.
I don't doubt that Bernie would compromise but the campaign staff will talk like any compromise is bad. That doesn't encourage voters who aren't fully in line with his views to support him. Unfortunately he filled his staff with loyalists who didn't push him to change his campaign. Keep in mind that this was the plan
He’s counting on winning Iowa and New Hampshire, where he was already surprisingly strong in 2016, and hoping that Cory Booker and Kamala Harris will split the black electorate in South Carolina and give him a path to slip through there, too. And then, Sanders aides believe, he’ll easily win enough delegates to hit him into contention at the convention. They say they don’t need him to get more than 30 percent to make that happen.
If that was the best they could come up with he shouldn't have run