I'm the original author. Any application built following the CQRS/ES pattern requires development of the same building blocks: command registration and dispatch; hosting and delegation to aggregate roots; event handling; long running process managers.

I built Commanded as a self-contained, reusable, open-source library. With the goal of demonstrating one approach to implementing the pattern using Elixir. I hope it provides some use. That's why I've written up the case study. Anyone can take the code as is, to bootstrap their own application. Use it as a learning tool, take away the good ideas. Rebuild and improve upon the bad.

I received a pull request only today adding support for Greg Young's event store. That's going to broaden the appeal.