Data Binding in Reactive Frameworks

The idea behind most reactive frameworks is that you have one directional flow because that's what makes it reactive. In this solid case, though, we don't actually do two way binding pretty much at all. It was a deliberate choice to make all of those interfaces immutable. So essentially, everything's read, write, segregated. Everything is called from an explicit setter but under the hood, mechanically, it is closer to the libraries like you're describing.