QR code backup is bad. Indeed, you should use secret code (in characters) for your backup, instead of QR code.
Im using it as back up for my some of my crypto asset wallet. How can you say QR code has likely more potential than in character type? When you use it for transaction, simply the confirmation would be guaranteed unlike character that you will used a copy paste method that have malware changing the address when you paste it.
I would be interested if you can expound the reason for this.