I don't understand the "now they're all different" facet of this. In my experience during the pandemic, they are all the same, just in a way that is not discove

I don't understand the "now they're all different" facet of this. In my experience during the pandemic, they are all the same, just in a way that is not discoverable, as you point out. But after the first time I realized I just needed to open my camera app to make it work, it became a really nice experience. There is a balance here - discoverability is good until it becomes clutter because nobody needs to discover it anymore because it is commonplace, and symmetrically a mechanism that is quick and easy but lacks discoverability is bad until it becomes commonplace and second nature. A great example of this is the mechanisms to open camera apps on phones (which this QR menu thing builds on!): there is no way to discover that I need to press my power button twice to open my camera, but once I know this and it is second nature, there is absolutely no better way to accomplish that task.