If there is a rule written down somewhere, then follow those rules if they want.
The DNC is a private organization, they can do whatever they want for whatever reason they want.
It probably wouldn’t make everyone happy if they skipped steps in their normal procedures, but I say “When has the DNC ever cared about making everyone happy?” It’s a big tent with a foundation of begrudging compromise. Some people will be upset, but they have months to get over it.
To my point- that’s all I’ve ever heard about a Biden presidency.
Don’t get me wrong, I’m definitely in “vote blue no matter who” mode. That said, if I can vote for someone that I actually like and that I feel has a better chance of winning, then all the better.