For me it is a mistake.
When you examine an artist who is a guest of another and has only that song, you cannot enter his biography or photo.
Let me give you an example: in my library there is a song which is interpreted by Enrico ruggeri and Andrea Mirò.
Andreà Mirò only has that song in the library and even when I select this artist MB allows me to edit only Enrico Ruggeri.
It would be different if Andrea Mirò had more songs as a single interpreter then he manages himself normally.