Only for cities you know very well, for sure, but also the implicit biases even if you do! It sounds from what you're saying like Jemisin has avoided this by having the avatarification process take place at a specific time, but IIRC in thecitysmith's 'verse they were sort of eternal, which left you with questions like - okay, it's good that you're considering demographic change, looking it up again I'm finding that Liverpool is Chinese and doesn't know why until the wave of Chinese immigration, which was better than I remembered, New York is Jewish, bUT I don't know how that was applied in cases of conquest rather than immigration.