My phone died at a pop-up dinner and I had to pay with a watch

I was at a new pop-up dinner spot in Austin last month that only took digital payments. My phone battery hit zero right when the $78 check came. The waiter pointed to a sign about their 'cashless future' and I panicked. Luckily, my smartwatch still had a charge so I paid through that app. It worked, but the whole thing felt like a test run for a trend that might leave people behind. Has anyone else been stuck when a place goes fully digital?