If there is nothing wrong with the Jedi, why do they need the Chosen One to come and balance things?

I don’t think the reasoning for why Jedi think things are out of balance is conveyed well. If the Jedi had become complacent, then they would think that everything is fine and that the Force is balanced. By all outside appearances, the Force does seem to be fine until the Sith start to reveal themselves, and even then, the Jedi are skeptical when Qui-Gon first tells them about the Sith’s return.

I know a common piece of writing advice is “show, don’t tell,” but I sometimes think George should have spelled some things out more clearly, even at the risk of giving too much exposition. Obi-Wan says that Qui-Gon doesn’t follow the code, but we’re never shown or told how he’s not following it. There are some references to Jedi’s connection to the Force being diminished, and we can infer that the Jedi have become too politically minded rather than focused on helping people, but that’s not something the movies acknowledge nearly enough. The films never call out the Jedi for ignoring slavery, for example. That could have very easily been made a major grievance Anakin had with the Jedi Order, but the movie doesn’t address it, which leads me to believe it wasn’t meant to be a moral failing of the Order.