I don’t disagree…but the party-line Democrats have been telling progressives exactly that since the Clinton administration.
Again, to be clear: I’m happily voting Biden this November, but the Democratic party has become very good at doing just enough to keep their core loyal while also doing nowhere near enough to keep the country out of constant existential peril, effectively cultivating that crisis as a (pardon the pun) trump card that they then use to tell progressives “what you want is less important than the current crisis! Just go along with us in this election and we pinky swear to do more for your causes!”.
They know if they move left they’ll be displaced by a combination of progressive candidates and centrists, so they have basically adopted the strategy of keeping the right just dangerous enough to be credible while keeping their left flank secured with a drip feed of snail’s pace “progress”.