Feng Shui is superstitious. However, many viewpoints in it are still very scientific, but people at that time did not (or could not) explain it from a scientific point of view, but explained it in a superstitious way, because people at that time paid more attention to this viewpoint.
Obviously, choosing Du Dong is not afraid of the sunshine. If you sit in the main room facing south, walking into the room and heading east is just the right direction, which is in line with the walking habits of China people.