Many believe that the party gave Biden and unfair advantage using their superdelegates. The Republican Party does not have such super delegates, and in fact in 2016 Trump won solely due to his ability to organize and rally a well-working campaign even as party elites were seething at his ascendency and insulting him in public.
Super delegates are undemocratic, and always have been. How does the party of 'democracy' get away with this? The GOP has never used them and always just let its voters vote. When the voters chose Trump despite the leaderships hatred of them, they all stepped aside. Are they perfect... of course not? But compared to the democrats, they've always stood by their voters.
Yep, the DNC has lacked the self-awareness in these past few years to gaze within and cull the cruft that 100% of their voter base hate. Superdelegates need to go. They're this generation's Korematsu (as in they are still active while people would rightfully think they're gone). I feel confident that superdelegates will come back to bite the DNC decades down the line.
In fairness, they actually did change the rules around them after 2016 but stopped short of removing them.