At no point were those things ever implied to be literal.
And I could counter that the main theme of One Piece is "freedom", and that literal destiny flies in the face of that.
And I could counter that the main theme of One Piece is "freedom", and that literal destiny flies in the face of that.
Even when pieces are in place destiny isn't set in stone since there's already been a Joy Boy with a grand journey and who had managed to team up with Poseidon on his time and is still known to have failed on his mission so even now with Shirahoshi inheriting the ability of Poseidon and people like Roger betting on the next gen there's no guarantee there will be a success besides being aware we are reading a manga.