Argumentative writing is to put facts and reason. As the saying goes, "Facts speak louder than words". If you want to make your point of view stand firm, you can't just rely on vague arguments. You should also cite a lot of examples to prove your point of view is correct. As for the number of examples, it depends on the structure of the article. If a parallel structure is adopted, each argument should be demonstrated with at least two examples. Of course, there should not be too many examples. Too many examples will increase the length of the narrative, resulting in a mixed list of materials and styles. Too few examples will make the argument insufficient. Enough is enough.