Yup! Agree with you re: QR code; however, if one has problems with the App, we were advised that the BP will be (perhaps the word is āshould beā or āmay beā) available to print. As you suggest, it doesnāt seem to make any difference anyway.
BTW, boarding in Southampton a few weeks ago, there was no Blue line; no Green line. Just two lineā¦one for āSuites, Elite and Platinumā; the second was āAll othersā. Easy peasy. Cheersā¦