Talking about serving no purpose, not only the future visitors and the Florian sisters, Nanoha and crew have no meaning in the story as well as the whole thing can be resolved by the materials alone. Without the materials, Yuri will just be blasted into oblivion just like the poor defense system in A's and the story will end in tragedy.
I think that is also one of the reason why Diarche dislike Hayate as well.
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