As A Graduate student

Why graduate students need to have required class which they must take some time?

How could the classes we take be user-centered (student-centered)?

What is the meaning of "Professor"? Why do people invent the term professor? And what are the main tasks for a professor? Professor as a vocation mixes the meaning of teacher and researcher. We need teacher for class, instructor for project, researcher for research but not for student, manager for the education institutes not for teaching and learning.

These questions fit in the education field all over the world.