You just answered your own question there.
Also, most of what you say there isn't actually supported - there's no indication the Eternal Ones care about World Souls, nor that the First Ones told the Titans anything at all. Nor does Draenor have a World Soul, so the Titans weren't interrupted doing anything. Aggramar just came across it and animated some mountains on a lark. As far as we know, the Elemental Plane (singular) is unique to Azeroth, too.
You seem to be going off D&D and then try to fit the WarCraft cosmos into your preconceived similarity.

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