[anuraaga]

Assuming someone actually knows it (most non-engineers will likely install an app not finding one called QR), I find the UX to show a small, non-persistent link hover on top of the code difficult to use compared to a normal qr reader (both built-in or 3rd party) which freezes with a large clickable region when it detects a code. Especially when outside and lighting conditions or angles can make scanning a code a challenge, having to actually click to complete a scan would always be a big problem for me, so eventually I installed a third party app. Finding the built-in "app" was nice to allow uninstalling that.

This may be a more important issue in Japan where I think? QR codes are more used than in the US and often require scanning around other people, or other physical challenges. I guess most here get around the problem by using an iPhone though which has a built in and highly obvious QR app.