The first is that it is easier to expose for a shaded subject. You don’t have to deal with intense highlights and shadows. Instead, you can rest easy knowing that the range of lights and darks in your image will be rendered properly by your camera’s sensor.
Another shaded but front lit situation. Notice the brighter background here.
The second is that this lighting scenario offers up wonderful backgrounds. This is an especially powerful technique when shooting during the “golden hours”, the time just after sunrise and just before sunset.
If you can position the subject so that the sun falls behind it, you can take images with rich, warm background colors. The key is to expose for the main subject (i.e., meter off it), and let the background remain bright. Use a wide aperture to ensure that the background is thrown out of focus.
Shading this cosmos flower allowed me to produce a more subtle looking subject with a beautiful background.
Shaded subjects can make for great photographs if you know how to use them!