Alt author here. I've actually begun to integrate some of the microflux ideas into Alt itself. Alt already has a lot of the benefits mentioned in the post: time travel, revert, record and replay debugging; but stores as reducers and having them not own state makes for clean code. However, I don't think one size fits all here, some stores are good as reducers of state and others fit a larger role. There are actually many different types of stores that get created in an application. This is really powerful but also confusing for beginners coming from MVC.

Anyway I'm excited for what the future holds for flux and excited for relay.