In addition to feng shui theory. Door-to-door conversation has really brought some inconvenience to our lives. For example, our diet may be leaked to a greater extent. Door to door, if we open the door from this side, we can see the scene inside the door at the other end. This will expose some privacy that we don't want others to see. For example, at some point, our room was in a mess. When a more important person comes to the family. At this time, if he happens to be opposite you, then your bad side is likely to be exposed to him.
Another word is living habits. The structure of old people's houses in the past is basically different from that of commercial houses now. So when their habits are broken, they usually think it is a bad phenomenon. Because many times we can't accept things that are out of habit. Then for them, they will feel that it is not good to come to the door.
Although many of them are not particular now. But for these things that science cannot explain. We'd better all be in awe. There is a saying that it is better to believe it, not to believe it.