Democrats do not really have a leg to stand on if they want to push progressive taxes. With the standard deduction at $13k/$25k, only the richest households in the solid Democrat states are affected by SALT deduction caps, and there is no reason for politicians not from those states to compromise on it.
Even the politicians from the high tax states have a tough time answering why they are holding up legislation to benefit the highest 10% of incomes of the state.
It was a pretty genius political move by Republicans.
Edit:
> There's no shortage of similar examples, from immigration policy to idiotic "easy to win" trade wars to USPS governance, where Trump policies have survived so long that it's hard to believe that the Democrats don't agree with them.
Also, a lot of these things require Senate approval which Dems do not have. When Trump was in office, all the Repubs were lockstep behind him, so he could push through a ton of stuff. Dems have not had this position since the Clinton days in the 90s.