Just mentioning, there is ngrx^1 which is the redux pattern for Angular 2 apps. It also integrates with Observables.

[1]: https://github.com/ngrx/store

Problem is you get a cumbersome templating language, extremely verbose component declarations, even more verbose dynamic components and a bunch of other horrible stuff.

In React it is a breeze to make Higher Order Components to connect to a store and it also makes it much easier to separate those smart components from small reusable presentation components.

I have seen people shy away from making smaller components just because Angular makes it so damned painful to make components. It is just easier to stuff everything in a template and copy paste everything around, which leads to a serious case of spaghetti code. I am happy for you if you don't have to work with something like that. I do, and I can tell you it is not nice in any way.

For most apps, yes I think MobX is easier. However, both of them, combined with React/Preact are hugely superior to Angular.