The Primordial World did not stop it, or rather, did not have the notion to stop it at all, because the initial world will was just a vague consciousness and wouldn't actively change the world, letting everything develop naturally. Hence, evolution was extremely slow, and after countless years, the world still had only monotonous species and colors.
This is like the ecology Mu You saw in Jie Lin. The closer you get to the center of Jie Lin, the more monotonous the colors of the creatures, and the simpler the forms. Before the divinity system, the world was just such a dull sight.
Without any resistance, the divinity system effortlessly transformed the majority of the world's realms.
However, when it came to the aspect of time, the divinity system encountered an obstacle because the entire time system had already been occupied by the 'little boy'. To completely transform the time system meant first having to eliminate the boy, which was the will of the original world.
