If I am reading his idea correctly you would only be loading like 7 custom plots.
There would be a single ward map, most plots would be generic. At the placard you can choose whose plot to enter which could be hundreds. When you enter a plot then it loads.
but when you come to your plot you see your stuff, but still have the option of entering other players' plots at the placard (if they are open to guests or you are a tenant). You would have the option of deciding what you see in 6 nearby plots.