Well, there are actually good arguments to be made on both sides of the issue. For example, one argument is, "why should people who live in high cost states pay less federal tax for the same federal services?" The counter-argument being "they don't need as many government services since they get the same benefits from their state" and also "their incomes are higher so their total dollar contribution is still just as high".

It's a tough issue. From the Federal perspective is makes a lot of sense to get rid of the SALT deductions, and I suspect the next time the Dems are in charge they will "be unable" to restore the deduction for "reasons", since both parties want the extra revenue.