Because it literally does not matter. He's a ridiculously small portion of what this arc is focusing on. You guys keep confusing bad writing with fan notion that shit needs to be relevant because you are a fan of x character.
There was setup from Inu that explained if Jack fought them under a full moon things would have been different. That already ended nd received payoff in chapter 992. Everything you've been getting beyond this point has been entirely extra to allow the reader to see more Sulong and a bit more of Jack in his minimal relevancy.
Clearly, in hindsight, Oda wanted to focus more on King and Queen. That was entirely apparent if you look at their reveal pages in chapter 926, where Jack is massively downplayed at the expense of their appearances.
So no, the writing is not bad at all, it's actually extremely consistent, because even in Zou Jack was not stronger than Inu or Neko, he had to cheat to win with poison weapons. He was reduced to irrelevance when Zunisha 1 shot him to oblivion. You've known how Oda has felt about Jack for over 200 chapters now. That is largely consistent writing.
What you don't like how he was portrayed, and thats a you problem, which is fine. I didn't exactly like it either. But that's a me problem, not a manga problem. One Piece is not a pure battle manga, the majority of the last 1026 chapters does not involve pure 1v1 battles. It is a shonen series for sure with plenty of action, but its never been its main feature.
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Not sure what you are getting at. Sanji vs Queen has been pretty hype and will continue to be until it's over.
Jack wasn't built up to be shit considering he was thrown away by Zunisha 200 chapters ago. Get over it lmao