It has global state. In erlang processes are long lived and you bring functions to them to do stuff. Suddenly you will do something and a piece of state that yo

It has global state. In erlang processes are long lived and you bring functions to them to do stuff. Suddenly you will do something and a piece of state that you weren't expecting will be in your process dictionary... Some erlang processes run for literally years - and exist over multiple releases of the software. Reasoning about how something did or did not get into the process dictionary is for the birds.