In the main anime, Luffy goes from crying on Amazon Lily to buff on Sabaody. 3d2y shows the brutal, bloody struggle. You watch Luffy nearly die to wild beasts daily. You watch him master the basics of Haki. Without this special, the power jump feels like a video game level-up. With it, it feels earned .
Perhaps the most compelling reason to search for One Piece 3D2Y Dubbed is the thematic exploration of Ace’s death. In the main series, the timeskip feels like a reset button. In this special, it is portrayed as a crucible. One Piece 3d2y Dubbed
While the events fit into the timeline of the series, the special is considered In the main anime, Luffy goes from crying
While the special was produced by Toei Animation, it is often labeled "anime canon" because it respects the time-skip, though the villain (Byrnndi World) is exclusive to this special. You watch him master the basics of Haki