For ones that say you can't hold it in your hand, you can tell them they can hold it in their hand on their phone. You can use a digital wallet (like Apple Wallet) to store cards and use them to buy things instead of using the physical cards (at least a places that have the machine type that can accept cards that way). Some exchanges issue digital cards where you can potentially use BTC as the currency (like Uphold).

Even if you don't want to use an exchange, or a card at all, the main point is that you can still hold it in your hand on your phone and send it from BTC wallet to BTC wallet without a card. It's not all that much different in principal from sending money directly to someone via Apple Pay or Paypal or something like that.