Not that many years ago, AMEX balances had to be paid off each month. They didn’t issue cards that allowed you to carry a balance, but, to increase their market share, they came up with a variety of other options.
Even though we plan to keep ours, I agree that this current interest rate move is pretty extreme, but they are still great cards with great benefits, if you pay the balance off each month. If not, there are probably better options out there.