So QR codes are great as part of a designed workflow where the reading app is well understood. The challenge comes in more ad hoc scenarios. Also QR codes hit

So QR codes are great as part of a designed workflow where the reading app is well understood. The challenge comes in more ad hoc scenarios. Also QR codes hit a certain practicality limit with size (2953 bytes to stay in spec) Perhaps a meta-point is that when you are trying to design a general purpose interchange format, there will always be scenarios that you didn't imagine. In this case I have raised OCR and (legitimately) many people's responses have been a rather polite WTF (although I did garner one downvote). Experience teaches us that formats will be used in unexpected ways.