With StoryMaps.com, it was possible to publish your StoryMap privately, allowing anyone with access to the link to view it. It was incredibly helpful for editing and finalizing StoryMaps before publishing so that 'Everyone' could view it, as it allowed you to share the StoryMap with others who do not use/need to use ArcGIS Online. Having the ability to share with users within your Organization assumes that we only work on StoryMaps with individuals or institutions that have (or are within the same) organization. I know there are ways to create Collaborations between Organizations, but this option is significantly more cumbersome and costly than sharing a private viewing link to review a StoryMap.
For users who switched to the Creator profile license with ArcGIS StoryMaps when Storymaps.com was shut down, it would be great to have this publishing option again. So many people and organizations cannot afford to purchase additional add-ons or licenses simply to have people be able to review and approve content before it goes 'live'.