I don't build walls are general rule(palisades only), because I'm always expanding and spend my time and money building other stuff. I rarely need to use upgraded walls for a serious defense.
The corollary is that the human player rarely needs walls whilst the ai need the best it can get as it is mostly under the hammer.
So my conclusion is that walls should give a bonus (like law+10%)to
1.encourage the ai as it needs as much help as it can get
2. Make the human player consider building walls for the bonus.
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