Storyteller has been updated a couple days ago. It is now compatible with WordPress 5 and Gutenberg. The update also introduced an Instagram feed (see it above the footer in the live demo). There are no plans to discontinue support for this theme.
Beyond the obvious stuff that can be seen right away: Narrator preserves the aspect ratios of the thumbs in picture galleries, while Storyteller makes them square (however both themes show gallery images in their original aspect ratios when in ‘lightbox’ view — when you click them).