You do have a point, but in this case the original purpose of property tax is so that there is a provision for taxing authorities to confiscate the property its

You do have a point, but in this case the original purpose of property tax is so that there is a provision for taxing authorities to confiscate the property itself, in case you or your heirs do not remain well-heeled enough to be fully welcome any more after the property is otherwise completely paid for. The money collected by the levies has always been just collateral damage.