Credit card annual interest rates can be as high as (or even higher than) 50%. This is not trivial, it can (and does) ruin lives. It is a type of debt (though conditional).
In my experience paying with credit is a fire and forget action, since the money is debited automatically at the end of the month, with no interest. The UX is great, since it only takes a card swipe [as long as I have the funds to pay it back and I'm within my credit limit].
In an scenario where you are not debited right away, I agree completely. But I would only expect that to happen by accident or if the user lacks the financial literacy to understand there are better ways to buy whatever they want. I may be missing some financial corner cases.