To support this, I'd like to add that in a lot of cases, specifically with characters, artists will use two texture sets for their "skin" material. One for the body, and one for the head/face, in order to preserve as much facial detail as possible for high fidelity products/experiences. When painting skin details manually, this will almost always result in some sort of seam across the clavicle/lower chest area, and will be visible if the character happens to be shirtless or wearing low-cut clothing. Clone stamp would help exponentially for cleaning up seams like this. There are many other examples for where this feature would be useful, but I just figured skin seams on characters/creatures would be the most obvious.