The loss of two godkings in a row was already a great loss. No cultivation organization could afford it.
Even though the demons were ferocious, they still could not treat the godly monarch as a child's play. After all, they were the highest level of combat power and the main Foundation to maintain the stability of the camp.
The loss of any Godking could lead to an unstable foundation.
Don't compare it to the wizard World. That was a true battle of extinction, so it was not surprising that there were heavy losses.
The divine King powerhouses from both sides had already exceeded six hundred in total. Moreover, they were all participating in the battle on the frontlines.
The war between the Yan Tian sect and the demon race was different. This was only a battle of interests. When the war reached its final moment, even a God King might not personally take the field.