My '18 base 718 is around the same miles and the areas below the rear air intakes look similar to yours, though a bit less noticeable as my car is Night Blue metallic so the chips are somewhat camouflaged. As that piece is plastic I weighed the cost of having it wrapped vs. having it replaced/repainted at some point down the road, and it seemed more or less even from a cost standpoint. Also, there's no risk of corrosion on a plastic piece, so I'm not too upset about it. My car is a daily driver year-round in southeastern PA, so I expect to get some chips, etc. along the way.