This is more of a conceptual question. Going through the flutter documentation I "In Flutter, it makes sense to keep the state above the widgets that use it". Going through the rest of the doc and example code, it seems that the doc wants us to use inly providers as states and use stateless widgets that consume the providers.
Am I correct in understanding that statefull widgets are to be used against stateless + providers or am I incorrect and we can use them both together to some other effect?
Yes, you can use StatefulWidgets with Provider / any state management. Provider provides global variables that needs to be used multiple times on application, or that needs to be stored globally, so those Widgets do not need to be Stateful. But Widgets that their state doesn't affect other widgets or any other "stuff" on the application can manage their own state.