Anyone ever wondered that although there's a load of different formations in the formation files, why we only see the one-and-only AI line we all know so well?
Here's why. It's set as standard formation, with an AI priority of 2.0. Most of the other formations have 0.6 priority. When you lower the priority of ai_standard_line to lower than 0.6 you will encounter the other formations on the battlefield. AI will still be stupid but a bit less stupid than before.
Try it, and we'll see if we can give AI some better formations.
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