It's like one of the older Sims games where if you get a character with certain traits (I think introverted and artist?) you can build them an attic with a fridge, a bookshelf, a bathroom, a bed and unlimited art supplies and they will willingly spend their entire life up there churning out art when they're working and reading when they're not.
Not only are they happy being relegated to a specific part of the house forever, they generate enough to fund the whole entire household.
Possibly not "unsuitable" but they preferred being closer to running water but not too close as a convenience. And/or a trade/fishing thing, I know the Yellow and the Yangtze are both huge sources of food and trade, not sure about Wangxian
Sort of a "this is going to be annoying to build in the moment but will be beneficial in the long term" sort of thing.