So let us count all the different races in One Piece: Giants, Fishmen, Lunanrians, Three Eyed Trible, D clan, Mermaid, Tontatta, Minks, Wano people, and much more.
Of all the races, only one has been relevant to the plot and that is Fishmen. Every other race was talked about vaguely and had no direct relevance to the main plot; they only had relevance to a self contained subplot. And now Oda created yet another race without even resolving any of the previous races ties to the main plot. Cut, copy, rinse and repeat.