Unless I am mistaken, Large Stone walls provide a +5 law bonus, bu that is insignificant when you consider how much time and money it takes to build them. The Large Stone wall towers have more attack and range.
Actually, in my opinion, it is easier to kill the enemies coming out of one siege tower than four ladders. Soldiers seem to scale the walls a lot faster when scaling ladders. I am also not so sure if you can destroy the ladders with archer fire/towers, which is very much possible with siege towers.
Nevertheless, I would agree that the large walls are useless. You should invest in economic, law-giving buildings, which reduce corruption, as well public health buildings, which increase population, therefore increasing the taxes.
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