[Lerc]

>In the research papers of any branch of science and technology, crediting the previous work is not some social convention, but it is very useful information for readers.

I covered that aspect. Those are thing that the writer does to increase the utility of their work. It is one of many ways that improvements may be done. That this particular way is compulsory and the others are not suggests that this is not the reason for the choice to make it compulsory.