The best practice is that the use case diagram should be small and crispy. The use case diagram illustrates the relationship between the multiple use-cases, actors, and systems. It is the best way to meet the requirements of the end-user. The benefit of using the use case diagram is that we develop the system with the user in mind. This diagram shows us the possible behavior of how the software will perform. When a system software is in the developing phase, then for making it perform efficiently, the developers specify different use cases to check the possible behavior of the software in different cases or situations.
