I see what you mean but don't really agree, the chapters that do not move the story forward allow to dig into characters, to get a better image of the universe

I see what you mean but don't really agree, the chapters that do not move the story forward allow to dig into characters, to get a better image of the universe we're reading about. I enjoy reading it, so I appreciate it's here, it helps immersion as the book is not only a specific storyline. I've always been frustrated in Harry Potter that there's not more writing about the lessons for example. There's quite a bit about it in the first book, then it's more and more scarce.