[bpicolo]

> to an object with methods would bring any benefits

It lets static typing do a lot more work for you when using Typescript/Flow. Less to remember and less to break.

Message passing is a really useful architectural choice because it lets you do powerful global operations. It's a lot crummier on the development ergonomics front.

[mezzode]

You can already write interfaces for your Redux actions in TypeScript to get the benefits of static typing, so I'm not even sure that there would be an appreciable improvement if Redux used methods instead.