Imagine I have a conveyer belt stretching between two stackable support poles, A and C.
I then add a new stackable support pole, B, half the distance along the belt, so the belt goes from A to B and then to C.
Now if I deconstruct the belt, the entire belt length, A to C is removed. Instead, it would be good if adding a new support pole caused the deconstruction sections to split into A-B, and B-C. This would allow you to reorganise belt angles and so on without having to rebuild unrelated sections.