3.x supports Angular 6 and RxJs 6 out of the box. However, you can still use it with Angular 5 by upgrading your RxJs version and using the RxJs compatibility package in your project.
Yes, we made a huge effort with 2.0 to ensure stability and good test coverage. There are several individuals who are using this in production today.
The main goal of NGXS is to make state management easy with as little boilerplate as possible. The question is often raised that we could reduce the boilerplate even more by just letting you call the method on the state rather than having action classes to dispatch. This is not really possible to do and keep a global state with rich debugging and hot reload capability. When we invoke a function we have to go to the global state and slice out that portion and pass it to the method. There is no good way to do this when calling methods directly. Additionally by using action dispatching, you can share actions between states and higher order states very easily.
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