I noticed that some module prefers to add their menu items under "Structure," while other modules prefer to add them under "Configuration."
I thought that the reason of choosing "Structure" was because the menu items were related to some kind of "entities," but I then noticed that Rules is adding its menu items under "Configuration." Vice versa, Views and Flags put their menu items in "Structure."
What is then the criteria to use when deciding under which menu a module put its menu items? Does the "Structure" menu contains only menu items that are related to content?