The Agile Manifesto works. All (Agile) methods/processes/frameworks do not work. The idea about he manifesto is to constantly (re)think about improving your process (read: way of working). When you adopt a process, like Scrum, and stick to it, you stop doing that. Thus, you are no longer agile.
I complete agree with you. Violation of the first principle of the Agile Manifesto happens way too often.
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