"A credit card built for the 21st century" is an oxymoron. It's like saying a car phone built for the 21st century. For the love of all that is holy and sacred, please eliminate the need to carry cards at all. Just let me pay with my phone. Put my drivers license, health insurance card, membership cards, gift cards, car keys, and payment methods into my phone. All of this already exists in some form or another, but A…
Dear gods, please eliminate any ability to pay with my phone! Cards are fragile enough. I don't want to lose access to all of my money if I accidentally drop my phone the wrong way. EDIT: Not to mention my ID and keys! I'm honestly not sure I could think of a worse idea.
This isn't true of physical keys/ID/money/currency, where it's completely possible to physically lose all of them, permanently.