I'm sorry to tell you that it's your insight that is falling off from my perspective. You don't understand the story, that's on you. Let me explain, yes this series include sci-fi and xianxia, like many others. What's unique though is the philosophical ideas it has that may offend people. As for the development part, first off, author started with the quick development of the MC. As the story progress, the MC's development is also progressing but slower than the start. However, at that same moment, author shows the perspective of significant side characters' development, I can understand development of those side characters take quite a long time for each of the significant side character, but it's needed for the story.