Here is the thing the Chinese tradition keeps circling back to and never quite puts on a poster. The moment a method of reading the enemy becomes canon — Sun-tzu's dust columns, the cloud-ch'i grammar, the five-spy typology, the active probe that flushes a "wise" or "stupid" general — that method becomes a script the enemy can perform back at you. Hsü Tung writes it down most coldly: once everyone has read the Art of War, you fake the hunger, fake the flag-chaos, fake the retreat, and the enemy's own well-trained analysis walks him into the pit.
So expertise is not a ladder you climb to safety. It is a legible surface. The better-read the analyst, the more predictable the inference he will draw from a given sign, and the more precisely the opponent can engineer that sign. Cloud-ch'i prognostication looks like the one unforgeable channel — the enemy can't stage the sky — until you notice the reading is forgeable even when the cloud is not: a scout primed to see a fierce general will see fierce ch'i. The vulnerability just migrates from the signal to the reader.
The Live Wire.
Links: The Contrary-Employment Doctrine, Hsü Tung's Contrary Terrain Practices, The Ch'i of Generals.