RxJS is not a replacement for redux, in fact ngrx is a redux implementation based on RxJS and Angular. It brings everything, including effects with their own plugins and it is quite a pleasure to work with.
I'm aware, I'm saying that using (a few singleton) services for managing state plus RxJS to effectively propagate (state) changes into every other component/service provides a comfortable development workflow/mindset. (I find redux-like patterns unnecessarily complex.)
I think RxJs evolved from "Reactive Extensions for .NET" which was quite popular even 10 years ago. So the core idea is probably well understood by many .NET devs.
