Hypothetical: If Democrats just nuked the filibuster entirely and passed Biden's whole agenda...

[Progressive Pessimist]

I think it would have done a lot to keep Democrats in his good graces, and when the benefits of many of the pursued agenda's parts became tangible the average American would probably warm up to them too. One thing you definitely wouldn't be able to criticize him for would have been not getting anything done, legislatively.

On the flip side, inflation and gas price increases likely still would have happened and the GOP would draw a correlation between Biden's agenda and all that. Furthermore, they would probably try to make it out like Biden is abusing his power.

I think it would have been better for the country though, in spite of the downsides and inevitably allowing  GOP having an easier time passing legislation the next time they get a trifecta. Even beyond the economic accomplishments our democracy would be in a better place if we had DC statehood, Puerto Rican statehood, and a new voting rights act all born out of the simple action of Manchin and Sinema ending the filibuster. That said, I don't know that those two would even be game for most of what the Democrats would want to pass. It would still be like pulling teeth in trying to get those two to agree to anything.

So, when we inevitably end up having to have sex only under the supervision of a clergy member, let's remember Manchin and Sinema as two of the biggest villains of the decade for allowing us to get to this point (though there is still more blame to go around).