To my knowledge it doesn't.
They said from the off with legacy mode they wouldn't design content around it and you wouldn't really be able to do top-end boss content.
The idea behind legacy isn't so much allowing players to permanently use legacy and only legacy - its to allow casual players to use a simplified form of combat for casual content and to give more serious players a familiar base line to learn from as they move into revolution and possible full manual in order to play top end content,
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