Why design indirect lighting?

I see lots lots of Taiwanese designer love designing indirect lighting for their clients, but why?

For particular purpose, or just looks fashion cause everybody have it at home?

I always remember the photo of worst lighting design cases that my professor Shunichi had shown us back to SJSU is the lighting design of in’n’out burger store; so many meaningless and useless lighting there.

I just got the same feeling when I saw indirect lighting design at most new Taiwanese interior design.