You could lose your phone, or even have it stolen.
I think of it as multitasking. A paper ticket means I can focus on reading etc on device, while the ticket can serve its purpose. I keep all pertinent materials in a pouch in front of me however so not hard to find.
At the airport? That’s fine. I’ll just talk to the agent and get a ticket if needed. I think these are just extreme cases that applies to extremely tiny percentage of people.
I think of it as multitasking. A paper ticket means I can focus on reading etc on device, while the ticket can serve its purpose. I keep all pertinent materials in a pouch in front of me however so not hard to find.