"Dems would've been better" is the liberal version of "does Israel have a right to exist".
Both are questions are intended to obscure the moral/political responsibility of those in power.
Did Democrats have an obligation to put forward an anti-genocide candidate when it became clear failing to do so would cost them votes? Did Democrats have an obligation to hold a primary given polls showing Biden's unpopularity two years prior to the election? Yes.
The but-for cause of Dems losing is not a Lebanese-American raising valid concerns about the nature of the imperial duopoly. Dems are the ones who chose Trump over Palestine. But I guess it's easier to blame Peter Daou.