But that's the problem - Agile is a list of suggestions, not a recipe or a system. So there isn't a fake or true Scotsman, there are only an outline of behavior

But that's the problem - Agile is a list of suggestions, not a recipe or a system. So there isn't a fake or true Scotsman, there are only an outline of behaviors, which each adopting team should use as the beginning of the conversation about what to do for themselves. Think about it perhaps like - you have the Magna Carta, the Constitution, and the Grundgesetz in front of you and get to make your own country, but there's nothing that says you must adopt all or even any of the provisions of those charters if they don't fit your needs.