> That's kind of the definition of encapsulation. State encapsulation, at least in FP, means that the state is not visible externally. For example a pure funct

> That's kind of the definition of encapsulation. State encapsulation, at least in FP, means that the state is not visible externally. For example a pure function that uses mutable state in its implementation. Such state does not contribute to the sytem global state. > This is repeated as a mantra without any backup. The more global mutable state your application has, the harder it is to reason about. That should be fairly obvious I think.