They may as well have called it “One Piece: Go To The Checkpoints On The Map, Dummy.”
And, so that no one will be confused about the genre of game that it is, they literally titled the thing “One Piece: World Seeker.”
That said, even though the One Piece video game catalogue lacks an open world entry, there are a ton of solid One Piece games that you can play before World Seeker devours your schedule and your existence.