I don't see how the theory makes any sense and that's not meant as a defense of Biden.
More to the point, the R's are taking a position of opposing everything that's attempted by the D party. The plain reason for that is that the two parties' ideologies are completely opposite.
The R's promote hardline Capitalism with no social content and the D's ideals are social change, which is socialism being contained in a capitalist system.
So where the Dems have tried compromise, that's far from being the reason for their failure. And the proof is in the Dems even failing to bring about any social change because of their own party members not believing in the need for social change.
That is, assuming that Manchin, Sinema, and company really don't believe in social change? It's more likely that they do but there's the payoffs that compromise ideals.
In essence, America's political system is a failure due to bribes and payoffs dictating the workings of government.