Jiang Chen hadn’t overexaggerated the problem one bit.
If the ten sacred lands fully lost control of Myriad Abyss, the descendants of the ancient war’s deserters would take over. Myriad Abyss would lose its fervor then, leaving a bunch of self-serving cultivators to lord over the land.
Under a culture like that, who would enter the offworld battlefield to fight off invaders? Certainly not the new rulers!
Of course, Jiang Chen didn't point all of this out clearly.
Technically, Yan Qingsang and Huang’er were descended from deserters of the ancient demon-sealing war as well. Though they had more fire than the rest, they were too unimportant to affect the grand scheme of things.
Moreover, they had been kicked out from House Yan. They could no longer call themselves its scions.
Because Jiang Chen had a ton of free time within the airboat, he took time to read the various works that Senior Pei Xing had left behind. The texts were quite enlightening.