Dressrosa did a fuck ton. That said, I think WCI's payoff hasn't arrived fully yet. If the entire BMP crew goes down in Wano, then it serves a big purpose. If Carrot continues to justify Pedro's will, even more. If Germa/Caesar become factors in a future arc, even more. If Big Mom gets her secret outed at Elbaf, more. Underworld Emperors getting elaborated on? More.
That said, it still has nothing on DR in terms of world plot being set up more.