Oh come on.... Machin and Sinema are stick in the mud for things that would help people, while the progressives would be sticks in the mud for things that are already popular and people want. One of those has more merit than the other.
And edge being that you think stone walling would be an issue that would cost democrats... why then wouldn't the democrats go along and make concessions on some issues? Such things only come from the right of the party but very rarely if ever (i can't think of an example off the top of my head) the left of the party.
Progressives have been winning seats and they often won those seats on the energy of voters who want them to fight.