There is a reasonable reason behind everything that you think is strange. Take the fact that people can't be put on the kang when they die. In fact, the main reason is that people are more painful before they die. Before they die, there may be some symptoms that pollute their beds, such as vomiting and incontinence. Generally, people who have lived in the countryside know that those who are about to die will put boards on the floor and put the dying people on the boards. The core reason here is still because of human psychological reasons. The old friend will eventually leave, and no matter how sad we are, it will be difficult for us to come back to life. But the living will live in this house after all. If we always think of this sleeping position when we lie on the kang every day, there used to be such a painful and uncomfortable picture, which may have a certain psychological shadow. For our future life, we will choose to let the people who are about to pass away in other places.
Let's talk about the folklore. According to the folklore of the older generation, the kang is the place where the living sleep. If a person dies on it, it is not necessarily a good thing for the deceased, because when he arrives in another world, he will walk with his bed on his back, and then he will take away the wealth of future generations. This is the general folklore, but the emergence of folklore is mostly based on people's psychological state, so all folklore is just to find some convenience for us living people.
To sum up, the dead are the biggest, and we are saddened by the people in the past, but the living still have the courage to live. We should not be troubled by this pain to the greatest extent, so we chose not to let the people who are about to pass away in the pit.