The anybody but Trump is what got Biden elected, so Democrats are not easily going to drop that strategy, especially when cynicism is the popular view of nearly anything today
Policies, programs, ideas, etc., aren’t sellable today, even if successful, infotainment has made melodrama the motivator, Americans wants good guys and bad guys, not about what you have to offer, it is how you portray the other guy. That was one of Biden’s problems last night, he was prepared to sell policy, and with Trump’s aggressive personal attacks, he was incapable of pivoting