What to use Services or Global Repositories?

Question

Software design

Good afternoon!
Why do we need global storages like Redux, Mobx, Vuex, etc., if we can move everything into services and store and manage business logic there?
Please share your opinion

Answer 1

Variables in services are not much different from global variables. In fact, these are global variables with all the ensuing consequences. For example, a service variable might change unexpectedly during some asynchronous action. Which will lead to unexpected/unwanted side effects. Modern OOP paradigms (for example, DDD) directly say that services should not store state.