I agree with you Paul. I do the same but do clean the action and grease it up. No deterioration of the insides of the barrels in ten years. They are kept in a safe with a golden rod.
I have told the story here before but I knew a female skeet champion with walls of trophies and her attitude is why clean the barrels, they just get dirty the next time. I did see some of her guns including a Krieghoff and a bunch of her 1100's from her earlier years and the barrels were fine after many years. i did not ask her if she cleaned the actions. Sorry I did not.
