Seat Covers = Cheapness
I would rather enjoy my interior without covers even if it means having wear and tear on my seats, than covering them up so they would look new after 10 years when the car is not, by the way when you sell your car* the buyer generally doesn’t really care much if the interior looks new or not because he’s buying a used car,
I say keep your interior clean, clean it every now and then and let it age with your car, Don’t deprive your self by covering it up, just enjoying it,
What next coving your sofas, your carpet, your toilet (house toilet not like the FordFreak’s comment) and everything else so it stays nice and clean, enjoy your car while you have it.
Nothing lasts for ever,
*(something i hope i don't have to do, if i do i hope it will be traded in for another mustang)