lol good catch most devs will use stock empty rooms and add beds and other items to make a screen there own. If you look at other games before AI was used many have the same buildings and interior designs. If you try creating new buildings and interior rooms that is a very time consuming job. A single room with out anything in it could take 2-6hours to make to get the right size, colors of flooring and walls then the light fixtures itself could take a hour to craft. If you want you can download for free Daz3d or Blender and test your own hand in creating scenes. There’s many devs that are self taught by trial and error.