It's not that Dynamis is 100% emotional. It's how it's manipulated that's the question.

No one taught us how to manipulate it.

No one explained how Hermes manipulated it to create an entity that could manipulate it at will...

The most nebulous thing surrounding Dynamis is the writing for it. It was literally a means to an end to up the power of Meteion to be greater than that of Zodiark or Hydaelyn. While also basically letting the writers be like, "Why did this work out that way? DYNAMIS BABY!"

God, I miss when it was Diabolos's dark dream.