In larger more built-out accounts, it can be tough to remember which apps are based on which web maps, which Operations Views are based on which web maps, and which maps use which services, etc. . It would be great to be able to visualize a list or schematic showing which objects are inter-related. Maybe even a warning if changing a map or service will affect any thing that has been built off of it.
This idea has been merged with Provide a warning about dependent items when deleting an ArcGIS Online feature service.
Perhaps as part of the items details page for a map or service would be a list or diagram showing what other items are related to or based on it.
This would make it easier to manage items in the organization.