The article focuses more on requirements but I think that traceability is at least equally important -- Why (what is the justification) to include feature X (in

The article focuses more on requirements but I think that traceability is at least equally important -- Why (what is the justification) to include feature X (in this way)? If this is disregarded it becomes difficult to work economically towards a goal. Unfortunately, it is often the way things are done because a) people want to satisfy their curiosity and "play" around with new things (which is fine if kept in check), b) problems are complex or poorly understood and doing something is easier than finding out.