> The fact that you do not have to pull a card or even your phone could make the transaction faster.

My watch was already there for those situations where literal seconds matter.

Ironically, they were 'retrofitted' onto the payment terminals at the local whole-foods. They used the same "magnetic stripe simulator" tech that samsung was shipping in their phones for a few years about a decade ago.

If you had jumped through the hoops to set it up to associate a palm print with payment details, the system is still just swiping a virtual card in the payment terminal which is objectively less secure than the chip/nfc that has more or less replaced the old mag stripes.