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People all have a herd mentality. Those who are so timid that they can't even kill a chicken can, with someone leading them, soon become experts at all sorts of burning, killing, and looting without any teachers.
This is, of course, a mental vulnerability that can be easily exploited.
But that's assuming they don't encounter an opponent.
An opponent who understands this principle as well.
Since ancient times, many trades have kept things secretive, with secret recipes and techniques passed down only to males, and families relying on these secrets from generation to generation for their livelihood... In reality, none of this involves much technical content; the advantage lies in the unknown.
Once everyone knows, the advantage disappears.
Wang Yunxiao might not be good at mental suggestion and psychological hypnosis, but he happened to be an expert at dealing with Echo Erosion.
Firelight and sound are the two Dharma Treasures for solving Echo Erosion.
