What does it mean to leave the scene in couplets?

There is a saying in some online couplets that "the scenery is separate". According to them, "solitary scene" probably refers to whether some scenes and pictures described in couplets are consistent and harmonious. Some people even say that different seasons and times can't appear in the same couplet, otherwise it is "out of sight".

I think this statement is wrong. First of all, the "General Principles of Couplet Law" promulgated by the National Couplet Association has never mentioned the concept or statement of "separated scenery". Article 6 has such a provision: "Semantic relevance. The content expressed by the up and down links is interrelated and unified in theme. " This is the basis of the so-called "isolation view". The so-called "content correlation" means that there must be some connection between couplets. This sentence is more general and related to the nature of couplets. Couplets are also a kind of literature and art, and literature and art rely on personal understanding. Different people have different views on the same work.