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Gameplaywise it makes perfect sense so yes I taught the AI to fort spam. If you don't like it then it feels like the argument should be about the mechanics of forts which makes fort blanketing necessary.
There's no reason not to fort spam and every reason to since it gives you major advantages in war and against rebels. I agree it's ugly but that's a problem with the mechanics and/or graphics, don't blame the AI for playing the game correctly.