Believe it or not, there are still people out there that think that a technology company is really about two types of people: engineers and sales people. People to write the software, and people to go sell it. Everyone else is overhead and at best a necessary evil.
For nearly every organization that has grown beyond a very early stage startup, one of the most common, yet difficult, questions is the optimal way to split up the product work. As soon as you have more than one product manager, or more than one interaction designer, teams face this question. And for larger organizations, this becomes a very significant and ongoing struggle.