As much as I love using this shield, I agree that it kind of does take away from the essence of individual elements. That's why I like playing Yugioh so much, is because there's no reliance on generic cards. But this does not affect the game's thematics nearly as much as people are thinking.
Most of the other elemental shields have something that defines it as a shield. Water's shield freezes creature, Death's shields feed off of death, Light's shields relies on

quanta. Even Earth's shield uses the element's defensive theme for extra damage reduction. This has nothing, just basic damage reduction.