So far not. But I can imagine things. For example imagine a Game of life component with two actions, "evolve" and "set_cell". Basically any time when it is awkw

So far not. But I can imagine things. For example imagine a Game of life component with two actions, "evolve" and "set_cell". Basically any time when it is awkward to have exactly one mutation function (setter) for a piece of state. Other examples are a minesweeper game. Basically any time it is too awkward to compose different mutations on top of a single setter. The other big benefit is that you can test the reducer without the component. And compared to redux, it still has a smaller footprint. So it doesn't have the dependencies, you don't need to setup a store etc.