People are too hung up on having a Act 3 ending scene, when the narrative should be about Wano ending as a whole and having the curtains drawn on it. Both metaphorically and on page.
Act 3, for all intents and purposes, ended with the defeat of Kaido and Momo's proclamation.
Why didn't we get a scene of Hyori playing the shamisen, the curtains, and a text box telling us it ended?
Because we will 99% get such a scene once the SHs leave Wano officialy. Just like we got when they entered.
And the difference between the end of Act 3 and end of Wano is certainly not more than a handful of chapters. Why repeat the same scene in such a short timespan?