Egeria's motivations
(rephrasing this question since it was confusing)
Why didn't Egeria transform the Oceanides into fully human beings?
I always thought that, since she is the heart of the Primordial Sea and was created from Teyvat’s original material, she had complete control over the Primordial Sea. I thought she had lost that control after being punished and imprisoned, and since she created the Oceanids—a new race in Teyvat—with just her tears, she had the power to create and manipulate life freely. I was thinking earlier that she had done this because she wanted to maintain good relations with both the Oceanids and the Celestia (transforming them into humans just enough to satisfy their desires, while at the same time not making them fully human so that she could undo it and HP wouldn’t see it as a violation or a sin), but the correct answer is probably that she simply didn’t have the necessary resources to turn them into humans.
But then I wonder, why? I know she wanted to grant the Oceanids’ wishes, but to the point of risking HP’s wrath? The Oceanids’ “wishes” seem like a very weak motivation for someone who is the Daughter of the Shadow of Life. This seems very nonsensical to me, as if she had forgotten to develop that part.