There are tons of everyday use-cases where it's preferable to sacrifice fraud protection to achieve instantaneous money transfer. Credit card companies have normalized using credit cards (with their attendant fees) for all sorts of small-denomination transactions, like public transportation, where the fraud protection machinery of the credit card system is of negligible benefit; it's a rip-off.
That makes sense for those stored value "gift" cards that are on racks at drugstores. But FedNow allows transfers of up to $100,000 at launch. That's big for instant irrevocable transfers.
