What are the advantages of reflected light in photography creation?

Reflected light can make the light distribution softer (but not necessarily as good as soft mask) and the light receiving area larger.

But the disadvantage is that the intensity of light will be greatly reduced.

In addition, the reflected light is also affected by the color of the reflecting medium. If the color of the reflective medium is dark, the reflectivity will be low. If the interface is red or yellow, the reflected light will also have a color cast, so we should pay more attention to the color temperature.