Why do smartphones have triple-quadruple cameras when “dedicated” cameras have just one? What makes it better and why do we not see the 3-camera setup on actual cameras then?
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Smart phones use multiple cameras because they are limited in the available depth. The camera already tends to be the thickest part of the phone, and engineers are pulling out all the stops to get it as thin as possible.
With more depth to work with they can use larger lenses and move them back and forth to focus, without using multiple lenses. They can also use a larger sensor as the lens can be a greater distance away.
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