Or put in another way, credit cards can be damaged by wallets and jeans. Apple recommends best ways to care for your credit card. I don't think the Apple document means their card is more susceptible to damage, if anything I imagine its far less so that plastic, but unlike other card companies who don't have to tell customers the obvious like other objects can scratch an object such as a card, apple has to since unlike other companies, apple knows people will immediately try to put it through stress tests because apple x product has x issue gets lots of ad views compared to other companies.