Even without Liliana telling him, Aegon knew it was a stupid plan. He had studied Soul Cultivation deeply under Kai, and he never spared any effort in teaching him everything he knew.
One's Soul wielded authority in the Main Consciousness from which every single Soul originated. That authority reflected in the physical plane as Soul Essence, so technically affecting Soul Essence never actually affected souls at all.
One grew powerful in Soul Cultivation by increasing their authority in the Main Consciousness, which allowed them more Soul Essence to use.
But a normal person couldn't access their Soul, which meant they wielded low authority. That resulted in low Soul Essence, so even if Aegon used his idea, it wouldn't work.
After all, the essence took time to form again and, in a way, it was part of one's being, so using it so much would also drain them. Unless he amassed thousands of people daily to have them drained, it wouldn't work.
'Stupid idea.'
