The EU4 devs have been using forum suggestions to aid gaps in AI

One fan in particular managed to reverse engineer AI behaviour in a way that was easier to understand than the code itself

Collections: Teaching Paradox, Europa Universalis IV, Part III: Europa Provincalis – A Collection of Unmitigated Pedantry

Let's Play Europa Universalis IV: Anbennar - Current Campaign: Balrijin

Steam Workshop::The Ultimate Collection of HOI 4 Mods!

Victoria 3 Review - Gamereactor

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Proof that the AI is excessively focused on the player : r/eu4

Europa Universalis 4 - Leviathan - Development Diary 9th of March 2021, Page 7

Paradox, please fix non-european nations having the same tech level as europeans throughout the entire game. : r/paradoxplaza

Steam Workshop::Sarge's Hoi4 mods

I left my economy to be run by the AI for 5 years, this is the result : r/ eu4

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Changes in the map between release and Common Sense : r/eu4

The EU4 devs have been using forum suggestions to aid gaps in AI development