Did you ever try to find out what a specific group address was used for 3-4 years after it was created, especially after the person that created it has logn since left the company? I did and trust me, it's a pain. What would really help is to have a description field in the group configuration menu in webadmin that can cold let's say a short description of the group's purpose. Currently I'm using disabled respond filters to do this, but it's a little counter-intuitive.