Fair question.
In software, as a golden rule, everything requires maintenance! The specific reports maybe not so much though, so we could keep them around.
To answer your main question:
Because seeing if any complaints show up is the easiest way to find out if something is valuable or not 
And in design, and to me personally, the concept of having a “extra” category that’s just shoved underneath come collapsible heading is a sign that the surrounding features aren’t designed well. Part of good design is also daring to prune away things.