QR codes are historically not shown by default because:
1. In previous versions, python-qrcode's output didn't fit on a standard terminal.
2. We needed a way to disable QR code output in certain cases (import, yubikey).

However, python-qrcode now fits. It is also possible to simply change the default of the qrcode option and disable the QR code output where we need it (import, yubikey). Showing the QR code by default has a UX advantage.