Because in that world, all living beings only had the path of cultivating Fighting Qi, eventually leading to the development of a highly advanced Fighting Qi cultivation. Although the limitation of Fighting Qi as not being a high-end cultivation method restricted the world's growth, the development of the Fighting Qi civilization internally allowed the world to evolve into a medium world successfully.
Upon learning of those things, Zhou Tian immediately took action.
Winning over a faction to deal with other factions, then slowly corroding that world's rules using this tactic—Zhou Tian had always employed this, confident it would work in the current world too. However, being in such a special world at that time, Zhou Tian couldn't help but develop some new ideas compared to his original old strategy.
Given the situation of that world at the time, even though Zhou Tian could corrode that world using his original tactics, he decided to use another method to corrode the current world.
