I worked for the sanders campaign in 2016 and 2020, I worked with a group called the restaurant opportunities center to help get paid sick days mandated in the city of pittsburgh and on an ongoing campaign to eliminate the tipped minimum wage in pennsylvania, I volunteer at a food bank and give people rides to the polls on election day. I don't owe you my credentials but there they are, out in the real world doing the real work to make things better for real people while you're throwing a tantrum online to punish the "moderates" because you're too cowardly to pick a fight with the people who have openly stated that they want to seize power so they can hurt you and me. "Did you tell anyone they were an asshole?" What the fuck sort of strategy for actually getting anything done is that. If being obnoxious, smug and morally superior was ever gonna work why hasn't it?

OK, but it's an important distinction, when you say:

The Democratic Party's ambitions extend no further and never will.

If, in that context, you mean the people who control the party, that's fine, you are correct, but other people are likely to hear that there is no hope of ever changing the direction of the party apparatus itself. We can see from the Republican party that it's not impossible to seize control of a major party - Trump and his maga cult did it. Bernie almost did, twice. We can take the reigns and steer the party where we want to go.