Why can't we nail too many nails on the wall at home?

Too many nails on the wall of a house will first affect the appearance, and then destroy the firmness of the wall? If a beautiful house, newly photographed, looks atmospheric, solid and beautiful at first glance, if you nail nails everywhere in the new house, the wall will also be damaged. In geomantic omen, it is not good to nail too many nails on the wall, so for the sake of beauty and firmness, less nails!