The beginning of the ninth timeline was indeed infinitely good.
With the help of Solution and the Five Hundred Year Plan, human progress was remarkable, making unprecedented leaps, but ultimately, the war within the solar system was lost without a fight.
Although it appeared to be a back-and-forth battle, every aspect of the situation was irreversibly driving humanity towards a desperate abyss.
Z Bacteria were too powerful.
Human technological advances didn't provide substantial help in the confrontation with the Z Bacteria.
Humans in this timeline did have opportunities to change the course of the war.
For instance, strictly implementing Willian's defense policies and avoiding contact with the ground at all costs.
Theoretically, it was possible for mankind not to be controlled.
As long as the possibility of ZS Humans' production was eliminated, technological superiority wouldn't be wiped out.