I guess it's impossible to create multiple walls in cities. If it were possible, we would probably have seen them in the Roman preview. (I'm not sure how to read the settlements depicted in the Boii preview, since the large city does seem to contain a very feeble second wooden wall.)
The only alternative around the lack of citadels in non-nomadic settlements would be to switch cities with castles and vice versa: i.e. to give castles to citadel-building cultures and cities to nomadic cultures, contrary to what the team said in the Massilian preview. This would however give birth to two problems: (1) Nomadic settlements would turn out to have a bigger population than their non-nomadic counterparts, which seems unrealistic to me. And (2) nomadic settlements would have more upgrades (6 kind of settlements) than the non-nomadic (who would end up having only 5 levels of castles). Therefore, I believe the team decided to drop the feature of castles with their ring-walls altogether, and to use the castle/city-dichotomy merely to portray nomadic settlements more accurately. A hard decision, but nonetheless perfectly understandable.
kind regards,
Andy
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