The recipe calls for the addition of 1/2 tsp. salt, so using salted butter would yield too-salty cookies. Cream cheese also contains salt. Also, in general, unsalted butter is the standard for baking.
It's much easier to control the amount of salt when you use unsalted butter, also, I find cream cheese to be a bit on the salty side so if you used salted butter they just may be too salty,
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