I use both the phone and the camera with two hands for stability.
Open Camera and Hedge Cam allow you to use the volume buttons for other things. I configured them for exposure adjustments. I’m OK with pressing the exposure button on the screen.
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In the area of amateur astronomy it’s nice to be able to control a telescope with an app from your phone or tablet. Touch an object on the screen (celestial atlas) and the telescope slews to it, centered in the eyepiece. But once there, with your eye to the eyepiece it’s EXTREMELY difficult to keep your finger centered over a virtual button on your phone’s screen, for example. However with a dedicated hand controller that has real physical buttons it’s a snap.
Maybe a technology will come along that actually (physically) alters the surface of a touch UI to emulate a real button that can be felt tactically.
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Just say “hey Google/Siri/AI Chat buddy” take a photo… 
you know because you will have great data connection in the dark sky location in the middle of nowhere getting that perfect shot… maybe it doesn’t need a data connection to do that anymore
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