Old but very relevant. You can't wipe the past clean because you choose to ignore the reality of it.
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I don't know how "most of use" any mobile device, but the sales of 6s seem to indicate people wanted to buy one for whatever the reasons.
As far as the camera, if you value camera you won't use a cell phone camera, no matter what the make. You'll buy a top of the Canon, Hassellblad or Nikon. Right? With the requisite 20 to 30 thousand in top of the line lenses. Right? With another $30K in specialized lighting equipment.
Now granted the right tool for the right job, but most of us have our cell phones in our pockets, where we can use it to take videos or photos and they are pretty darn good. Those who have some background in photography can basically tell the difference as long as the photos aren't jury rigged in some manner.
We had group tour a month ago. We tried to use iPhone for group photo (40+ people), there is no way for iPhone to do without squeeze everyone. The group just won't fit into the frame.
Even if iPhone can take large group photo, quality will be very bad.
The we take out Cannon camera with wide len attached to the camera, taking large group photo is easy. You can easily see everyone's photo when 100% crop, where there are lots of noises from photo taken by iPhone.
One thing is for sure. If you want take good photo, iPhone is enough. If you want take decent photo, iPhone is not ahold tool.