It is showing wear after usage! I almost cannot believe it: what mad company designs products that wear after usage? Would you also say the amount of battery cycles left before the battery charge holding starts blowing, has decreased after using it? That would undeniably be undeniable real world unmisleading too! I would get a battery case for that to prevent the wear.
You need to calm down. I am on your side. All of my Apple products show wear. Their use is what I enjoy and not putting them on a pedestal and praying to them!