Yes, I am very familiar with zbarimg and qrencode. But, other people might not be, and that's why just scanning a QR code works. Not everyone has Bitwarden, 1Password, Pass, keepass, etc.... also these tools may not be approved by your security teams.
And we are talking about the root account for your production AWS account. No need to get fancy. Just print the QR code, and put it in a safe hoping you never need it.
