Wait, that's not how this works. Neondt, who is writing the Dev Diaries about East Asia right now, is not someone is in charge of the AI. His work is designing mission trees, updating the Map, creating new events, etc.
There's teams in charge of projects. There's not like dozens guys at PDX who work on EU4 and can do everything. They specialized. They do certain things, and do them well, but they only do those things. Just like every other workplace as well. If you get the guy from accounting, then he can do accounting. Not whatever the fuck the rest of the company does.