I think it may be a kind of standardization. Everyone uses the same suffix to prevent typos. In the past, some people called it "university" and others called it "school", which was easy to be mistaken. In addition, it is also for alignment. For example, it used to be called XX College, but it is actually an independent institution, but it can easily be considered as a subordinate unit of the university. Not only universities, but also middle schools. It seems that primary schools have always been called primary schools, so there is no need to change them. Because there are primary schools and secondary schools, it will be easier to get into a higher level university.

Then the following are additional possibilities: the word "university" is taken from "the way of university, in the Ming Dynasty" in "University". Being called a "university" means that students have basically understood common sense and will take part in the work. Previously called "school" and "college", without this depth, natural universities were renamed "university" in order to meet the depth.

In another case, the name is changed instead of the suffix. Generally, I changed the name of the school because I thought it was too bad and ugly to promote it. There is also a public school principal who has changed, and the new principal wants to make some achievements. By the way, as the first principal of the new name school, changing the name is also a means. If the name is changed, it will definitely be written into the school history, so the name of the principal will also be written in.