Note: It seems like using the reactive way for the state management is more like automatically updating the states of the variables. But the simple way is more like manually updating the the states of the variables with the help of a method.
So, when we use Observer pattern in Qt i.e. we manually write code for connecting signals to slots and there are 'setState' functions which are called by us to update variables, is this called Simple State Management?
Does it mean that using Observer Pattern, we need to write code for fetching the changed variable state and then update the variable ourselves? So, Observer pattern is simple state management?