Matted hair can produce skin problems, irritations, sores, etc... Curly or not blown dry would be a better "grunge" look than mats. IMHO
Cords don't start to mat until about an inch from the skin.cords aren't supposed to go all the way down to the skin if I understand correctly. So they don't pull on the skin. They are also thin and lghter in weight that regular matts that may be very large and pulling on skin over a large area.