Sometimes, dealers do things that defy logic (surely not, LOL...)
My 2018 Sierra with 42,000 miles had a new set of tires, as well as all new brake rotors and pads when I bought it. It somewhat concerned me when I bought it, expect that the truck had zero evidence of *any* hard use at all from its previous 70+ year old owner. But I'll admit that it rode and drove really nice with those new tires and brakes.
I guess it is possible that my truck came in on the spare tire (with a flat in the bed) and a slight brake shudder when it was traded in.... and someone simply loaded the parts cannon, instead of actually taking the time to figure it out.
I viewed the new tires and new brakes as $2000 in extras that I wouldn't have to worry about again for a good long time. Sometimes, a gift is a gift.