If the ending of an anime is different from the manga, is it a bad adaptation?

This question can go for books/movies, comics or really any adaptation. What does a director adapting a piece of media have to prioritize? If this director sees the ending of a work and decides to change the ending to fit his own view, has the adaptation suffered because of it? Imagine a scenario where the ending is, on an objective level, neither better, nor worse than the original ending. Is the new ending a poor adaptation on the sole basis of its deviation from the source material? Or conversely, can the original intent of the author be bent to serve a new story?

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