I am working on a product which requires people to scan QR codes to access features. It would have been better if any Phone out there could scan QR codes without installing any other scanner app.<p>Why isn't this the case?
My Moto X (2015) camera app automatically scans not only QR and bar codes but also scans and OCR's business cards. This might also be true on recent Nexus devices though I don't have one so can't say for sure.
I agree it would be great if smartphones had a QR code scanner built-in. It would save lots of code duplication for basic tasks.
On the other hand, you would have to trust that native app being the 'man in the middle' for the data scanned.