One Piece theory explains why Black Blades are so rare (even amongst legends like Roger & Whitebeard)

In the vast world of One Piece, swords hold a momentous role­ as formidable weapons wielde­d by exceptionally powerful characters.

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In One Piece chapter 966, when Whitebeard and Roger clashed and

A little Zoro theory I had floating in my mind, what do you think