In a massive battle shonen like
One Piece, that
twist and development inherently rely on stakes and tension. You don't write a 1,100+ chapter action epic about a global war against a tyrannical government without narrative tension.
Claiming tension is just a "Hollywood tool" ignores how Oda has written
One Piece for nearly thirty years. Oda is the absolute king of using
artificial countdowns and extreme tension to drive his arcs:
- The ticking clock of Alabasta's bomb.
- Enies Lobby before Robin reaches the Gates of Justice.
- The birdcage in Dressrosa.
- The island of Onigashima falling on Wano.
- The global flooding countdown by Vegapunk.
Oda loves tension. Saying a story doesn't need it might apply to a slice-of-life manga, but applying it to the climax of One Piece is pure delusion.
P.S. Weeeeeding Caaakeee also goes there.