For winter driving they do. Their is a top layer installed during the factory process which is the last coat applied. The old rule of the thumb was you needed to have at least 250 miles on it in order to have the designed traction goal. The layer will rub off. Today's tires seem to breaking in much faster. My current set, broke in around 100 miles.
For the other three seasons, to my knowledge I have not heard anything about that. My experience, it all depends on the tire. The better tires on dry pavement grip as it is designed for. It wet weather, again it depends how the tire was designed for hydroplaning.
Most tires when new will "improve" a little after a few hundred miles at a minimum in my experience as well as others who have posted the same opinions over time. Those miles take off the "perfect" surface of the tire that was formed by the molds, etc. I know that my Nittos, while feeling good from the start, started to feel "really good" after those initial miles passed. Now at about 4K miles, they feel "super good", if you catch my drift...
Traction tends to improve as well.
Dunno how modern wheels/tires tend to stay in the same position when lubricated for installation if these are aftermarkets. They used to have the bad habit of slipping around the rims a bit and unbalancing if you hot rod too much for the first few hundred miles.
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