When Multiple Scene Editing was first announced, I imagined that each Scene would get its own Scene View. In the actual feature in Unity 5.3 all Scenes are layered on top of each other in a single Scene View. But I wonder if there are use-case scenarios where loading Scene side-by-side, as in my initial thoughts, would be preferable. For example, when you want to combine pieces of unrelated Scenes into a new Scene. Or A-B testing several variations of the same Scene.