If we consider that the entirety of Wholecake was essentially a setup arc for Wano, I'd even go as far as to say that it might be the best arc in the series. Suddenly, within a single plot line, the entire focus of one piece, as a series where numbers don't matter and aren't threatening, and where obviously all plans are doomed to fail, gets turned on it's head. Suddenly, Wano speculation about certain factions, certain crews, certain individuals changing sides, all becomes relevant. The entire concept of a Yonko Crew is finally understood, and one piece arcs can finally be given their "endgame window dressing".
That the actual standalone plot line managed to be even slightly satisfying after all of that setup it needed to do, definitely goes to show how masterfully it was all executed.