It can be very difficult as an admin to create a new map/app/dashboard/experience builder only to realize you didn't share a specific item for a specific group. As admin/creator - you likely have further access to items and may add a new layer/item that cannot be accessed resulting in poor consumer experience. Also posted on ArcGIS Enterprise Ideas Enterprise Ideas Link
My idea is to allow either creators and or admins to 'view-as' and select option such as member of a group, outside public, shared collaboration, viewer in org, etc. when editing an item and preview it from the point of view of the intended audience.