Yes, it’s the curse of the big post-skip One Piece arcs from which the majority of their problems fall. I prefer the Wano cast to the Dressrosa and WCI cast, but it could still use some judicious pruning, starting from previous arcs
-Saobody. Nine new upcoming pirates? Not sure that was needed. Kid, Law, Bonney, Drake. They’ve all got a role to play. Capone, Oda fitted in much better. Apoo and Hawkins, nope, Urouge, we’ll see, Killer, I’m 50/50 on
-Zou. Should only have been one king. In the long run, the feud between Inu and Neko accomplished nothing. Nor did Inu do anything in the first two Acts of Wano. One king, sent to get Marco, comes back in Act Three, accomplishes just as much
-Tenguyama, Tama, Yasu, Toko. Do we need these to be separate characters? Could they not combine into one father adopted daughter pair, that have something to do with Luffy and Zoro? Tbf, one of the wiser things Oda has done has put Toko and Tengu out if the Onigashima plot entitely, because they aren’t neccesary.
-The Scabbards and Hyo. Is Kiku really neccessary? Could Ashura and Hyogoro not be combined in some way, as “broken“ criminals at the start of the arc? Kawamatsu, who is in jail just like Hyogoro? Kawamatsu and Denjiro, both of whom share the role as Hiyori’s protector?
The lesser characters like the Yakuza bosses and the Mink musketeers not doing much I don’t mind… but there are a lot of them. We’ve always had Chaka’s, Wyper’s four friends, the shipwrights, the Franky Family, the Risky Brothers, who get designs and a couple of scenes but don’t do all that much. Maybe cut the number down a bit, but eh.
Then there’s the Big One, Big Mom and her crew. 100% a last minute addition to the arc to try and cut down the length of the series. In fact, I’m pretty sure that’s a leftover from WCI, where the Katakuri fight was stuck in at the Tea Party. I am certain the original plan was for the full crew to be the villains on Elbaf. Instead it’s been stretched out over three arcs so the Elbaf arc can be done quicker. Whether that actually saves any time…
And the best thing that Oda did there was just keep the rest of them at the bottom of that waterfall, cause they aren’t going to have a role. Just forget about them. Big Mom’s use has been patchy at best, but Perospero has been fine.