States like California,New York, Illinois etc use property taxes along with other types of taxing revenues to subsidize their wasteful social programs such as sanctuary cities and states.
These states wind up being indirectly subsidized with mortgage and property tax (deductions) write offs.
Rather than eliminating these write offs how about working up a bill formula where these deductions are graduated and apply to states which are using a high percentage of such taxes to fund those programs. But requires such states to develop other sources of revenue locally rather than dumping their bills on the nation.
I don’t know if I agree with all the reasoning, because NY and CA are high income, high property value and high population states, which all contribute to their higher tax rates, but yes, I agree that it would be simple to limit property tax and state and local tax deductions to the national average. i.e. Enter the amount of your state and local taxes, but not greater than $x,xxx. Enter the amount of real estate taxes paid, but not greater than $x,xxx.