Does no one remember what actually happened?
All the other candidates except Warren made back room deals and dropped out around Iowa, suddenly and for no reason. Leaving Biden as the obvious selection, and Warren there to siphon off Bernie support to make sure he wouldn’t be a problem.
The base voted for Biden after they had no choice.
Biden keeps saying democracy is at stake but the DNC seems to keep avoid any democratic process to find their candidate.
0 - https://en.wikipedia.org/wiki/Wilding_v._DNC_Services_Corp.
People like to imagine that the Parties are these kind of quasi-public entities that exist to serve the American people. They’re not. They’re private entities that are vehicles for the acquisition of power across local, State and Federal offices that are in a perpetual term-based competition with each other. We tolerate their campaigns because their battlefield is the ballot box instead of actual fields, but nominee selection still happens at conventions run by the parties themselves.
The Primary system you are familiar with is one that the Republicans and Democrats chose for themselves to inform their overall decisions on who to put forward as the candidate flying under their banner and has only been around since 1972.
https://www.newsweek.com/msnbc-host-chris-matthews-ties-bern...
They quit because they got their faces ripped off in a fair fight, not because of some backroom party shenanigans.
The associated press wouldn't even call a winner for the Iowa caucus due to how poorly it was run https://apnews.com/article/fc6777e93b8c50b2fd20e0d31fcc43b3
There were definitely some interesting things going on in the 2020 Democratic primaries.