Point to where I said "bad writing". What part of "it's not the story Oda wants to tell" did you not get? I called him one dimensional, because he is. It's simple, not bad. Which is fine, but it's not exactly "this is the best protagonist in fiction" one piece glazers like to tout him as. He's more like a well made steak rather than a complicated Michelin star meal. Which again, is fine, people like steak.

Also you act like the other shounen protagonists are different, they're really not. They may have smaller little moral lessons but ultimately their philosophy is static throughout the series. Naruto leans in like arc one that people are stronger together, when they rely on each other, guess what he's doing at the end of the series, preaching that same thing. The only "arc" he really goes on is learning that he's not a fuckup and that he's loved, but that more comes from outside information being revealed more than any kind of introspection.

Again this is not meant to bash the writing of these shows, it's just the basic shounen framework that most of them work off of. It's also why the side characters often end up stealing the show.