Comment by schreiaj

No, I actually like that approach better than the traditional ECS approach. Though I assume it both adds and removes some complexity. In a traditional ECS approach you can depend on certain systems running in certain orders because you depend on them having run. Then you refactor, forget this dependency, and suddenly you have changed behaviors and you have no idea why until you remember this. If, as I assume, you have per step immutability that removes a whole class of bugs at the cost of a slight increase in complexity.