Jap,
“There is a need to make them think that learning is also important and not only grades.” You are 100% correct on this point. I believe that evaluation as a purely diagnostic measure can work, but only if the goals for a class are clearly stated, are justified, and clearly related to the student’s benefit. When that happens, then the students will engage more with their learning processes and not experience the alienation from their work that the current grading model perpetuates.