Sure. Where you actually put stuff depends entirely on the complexity of what it is that you're building. If you have an async function that you need to use in several places then it makes sense to keep it separate. If you have several of these then maintaining a separate container component for each view component that needs access to these quickly becomes unmaintainable.

On the other hand, keeping them as separate functions and adding them in via redux `connect` syntax and `mapDispatchToProps` is simple and makes it clear what's going on. In this scenario, the `connect` higher-order-component acts like the container class, but it built up from separate parts depending on what you need.

> redux-thunk seems to encourage that you use it for everything

I don't think this is true. redux-thunk is a piece of middleware and that's pretty much it. It should be used however is most appropriate for your application and your particular use case. Keeping state inside components isn't always appropriate, but isn't always a bad thing either. If one is growing too complicated, then perhaps the other is more appropriate.