One of our tires has a little divot in the sidewall; our Toyota dealer said we should replace it. Our neighbor, who could be a car mechanic if he wanted, said maybe we should rotate it to the back, but that it wasn't a problem. And the people at Goodyear said the same.
And then they rotated them for free, and checked the brakes, because they're Goodyear tires! How 'bout that?