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The one common characteristic of successfull series is that, even when they borrow themes from previous ones, they all have something of their own they want to say. When the author gives out something to the world, it is because his sense of self has something he wants to convey to a larger audience, and that is becoming obvious as the series presses on. The one question we always think of, is: "Why do you write? What do you want to write about? What do you have to say to the world?"
Well, Tabata just wanted to draw cool magic battles. That's it. That literally is all there is about it.
Black Clover pretends that it has other ideas (classism, racism, etc) but it ultimately is just that: play pretend on what made One Piece popular.