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. I think this would also be useful from an ArcGIS Online standpoint as well and is cross posted here
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.