I concur, and I'll add that QR codes are mostly useful when you need to quickly transfer a string of data from the analog to the digital world, while also ensur

I concur, and I'll add that QR codes are mostly useful when you need to quickly transfer a string of data from the analog to the digital world, while also ensuring some data integrity during interpretation. I can see those complement some human-readable text to minimize manual data input (and the inevitable typo) where required.