I was in Japan last month and I used cashless payments at 7/11 and other convenience stores. It's pretty much like crypto where you show QR code at the register and they scan it.
If stores started accepting crypto for payments like this, I think I would use crypto. No need to worry about getting change or finding the right bills in your wallet. Just pull up your QR code before you walk up to the register and scan.

I'm hoping one day this will be possible.