The feature is supposed to be built into other apps like whatsapp, Instagram or Facebook messenger. From there it offers a faster experience than jumping to the iOS camera. It is also faster than aiming for buttons to get to the apps' camera.
It's an idea for communication/social networking apps, that have a camera feature built in. It is not available in any app so far, but I'd love to see someone pick it up.
Basically turn the phone sideways and the camera turns on. Turn it back to portrait and you are back in your app.
I'm borrowing from snapchat here which uses a similar concept (tap for pics, hold for video) and tried to cut/avoid additional steps. As for focussing: why must focus and trigger be two distinct actions?
Thank you for the feedback. I hadn't thought that it could be interpreted that way.
The idea is that it tapping and holding for photo/video works anywhere on the screen.
I also would like it to focus on tap (shooting = focussing)
my guess would be that every whatsapp account is associated with only one phone number, and you might have to introduce a separate layer of identification.
personally, i like having one reliable messenger on one device.
the current implementation leaves room for speculation. especially, since others have pointed out, two checkmarks only show that it has been delivered.
the "last online" time means (AFAIK) the last time the user was using the app (could also be in a different chat).