Nice concrete walkthrough of an otherwise abstract concept. I'm not sure the source of code complexity that I worry about most is the number of possible state t

Nice concrete walkthrough of an otherwise abstract concept. I'm not sure the source of code complexity that I worry about most is the number of possible state transitions, but that does seem like a legitimate source of complexity. It would be great if the article acknowledged that these design patterns help reduce complexity in other ways, like more macroscopic codebase structuring, as an example.