What are you talking about? The appearance of the card itself is one of the primary selling points that multiple card issuers tout. AmEx is very proud of the Platinum appearance. Chase/Marriott and Chase/Amazon made a big deal out of the fact that they have appealing metal cards. For many years one of the biggest marketing points about the Chase Sapphire Preferred (and now Reserve) was that it was a good looking metal card. I personally remember it being made a huge deal by Barclaycard when they redesigned the Arrival+ card.
Hell, some banks even use the customization of debit card appearances as a selling point for extra fees.
And yet, not with a single one of these have I ever seen anything warning about the card becoming damaged/discolored/scratched. Indeed, I personally have multiple AmEx cards, as well as the CSR and CSP, and after years of use (and gasp storing them in a leather wallet) there is very minor discoloration on one of them while the rest still look great.
The entire discussion about the appearance of a damn credit card of all things is absurd. It was absurd when every other card issuer did it, but it's even more absurd now that it seems to have been brought to the forefront by the Apple Card.