In the time before the (in)famous pax romana every city and settlement at that time, that was autonomous and could afford it, was walled/had defensive structures. So CA´s "Minor Settlements are unfortified" decision is (historically) stupid, because: if they are important enough to be a settlement on the strat-map those settlements were all important enough to have walls in reallity!
Ofc this is only is valid for Greeks, Romans, Syrians, Celts (Gaul, Iberia and Britain). Nomads had ofc no fortified citys (who would have guessed that?), and Germans had the habit of circulating with their villages in their tribal-territorry, so their villages wouldn´t have had too much of fortification (in fact they were mostly unfortified). So fortificated german and nomad settlements are indeed disputable, but walled greek, roman, carthagic, north-african, celtic and orientalic settlements are historical accurate and therfore it needs some very important arguments to not fortify them.