You're right that this won't be adopted by 100% of attendees overnight, but we try to nudge them in that direction in the UI (make it default over the barcode ticket, etc.). Even still, If 20% of your line gets through extra fast, it still makes a difference. And in a few months if that goes to 30%, 50%, then that's something.

But a key part of this is many of our events don't scan the tickets (doesn't feel right for them), so this allows them to do something better than collecting paper tickets or finding a name on a list, and it's fun for the attendees who chose to use it.