And then one authors of the book state: "if you know nothing about Scrum, implement everything as in the book, otherwise adapt to the situation and the team. If

And then one authors of the book state: "if you know nothing about Scrum, implement everything as in the book, otherwise adapt to the situation and the team. If not you will surely fail [...]" But being "Scrum.org certified PSM", how do you see your colleague from scrumalliance.org?