With the new 1.10.0 release, Aesop Story Engine now supports Gutenberg.
Gutenberg itself is in constant development, thus the Aesop support for Gutenberg will evolve in future. We are not suggesting everyone update to Gutenberg at this point or any point in future. Most likely WordPress will continue to support the users who choose not to switch to Gutenberg. But Aesop will support those who choose to switch to Gutenberg.
Thanks to Paul Eiche and others who supported this effort.