Many photographers would probably agree that the image quality of smartphone cameras has improved rapidly over the past few years and in many cases now rivals the output from some conventional digital compact cameras. However, even if the image quality of the smartphone camera in your pocket is all you need, there is still one area in which conventional cameras offer undeniable advantages over smartphones: ergonomics.

Multi-touch smartphone displays are great for general use and navigation of mobile devices, but many photographers prefer physical buttons and dials for setting camera shooting parameters over virtual controls on a screen.
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https://www.dpreview.com/articles/0760115092/the-miggo-pictar-is-a-pricey-camera-grip-for-iphone-photographers