That sounds vaguely similar to "Functional Core, Imperative Shell". I merge state management and coordination (together, the shell) so that the logic (the core)

That sounds vaguely similar to "Functional Core, Imperative Shell". I merge state management and coordination (together, the shell) so that the logic (the core) can be composed of pure functions without coordination overhead. So far I've done very little testing of the imperative shell.