You can usually get the ticket printed at the desk, print it at home, have a PDF on any device like a Kindle, take a screenshot of the QR code, add to your wall

You can usually get the ticket printed at the desk, print it at home, have a PDF on any device like a Kindle, take a screenshot of the QR code, add to your wallet on your phone even without proprietary apps, etc… I download the airline’s apps, but I hate relying exclusively on these potentially unreliable apps, or unreliable phones so I always get the ticket in other formats, too: always have an analog version, and some form of digital version on at least two devices. I don’t travel often, but when I do, missing a flight would be expensive or annoying, so it’s a reasonable trade off for me, ymmv. With that said, I also don’t fly Ryanair, so they can do whatever they want.