Well, Europe as a whole is not in Yliakum is it? Yet the current buildings have a very European feel to them, many seem to be British architecture in fact.
I don\'t think that rule can solely apply to one culture and not another. They already use designs from one culture, why not from another culture?
I feel that all buildings should be custom, but the devs are following known trends, and that is their choice to make. I only hope each area has it\'s own style.
You\'ll likely find that all architecture in games is inspired by real architecture.