The political parties have absolutely nothing to do with democracy. They are literally fundraising organizations with 0 accountability, and the only reason they get special attention like primaries is because their candidates tend to win elections and make policy.
There is absolutely no reason for them to hold 'elections' internally aside from the theater of it... They could 100% legitimately throw a dart at a dartboard or read tea leaves to pick their candidate if they want. Crying about how the 'other side' didn't do it how your side did is silly and disingenuous at best, and more likely just talking points to regurgitate.
The DNC and RNC are organizations, there's no reason outside of organizational preference for them to hold votes... They could flip a coin for all 'voters rights' are concerned. They are literally just fundraising organizations that pick someone to throw money behind.
Party affiliation, for all intents and purposes, shouldn't even be listed on the ballots and the only reason they are is because the two parties realize splitting the country is a better way to raise funds than any amount of policy or good intentions.
based on his performance at the debate, we can clearly say Biden isn't a threat to anyone. It is the DNC and others that are the threat. Biden doesn't even know where he is most days.