Maybe there are differences in what is needed to study a topic. Usually academic students must meet stringent requirements. They need to have a solid background in the theory and methods of their field and demonstrate a good knowledge. Prior to beginning work, a student will need to draw up a formal, written agreement with his/her supervisor. The agreement, which must be approved by the university, will outline the objectives of the research project and an individualised plan of study.
Let us assume that a student wants to research Diana, Princess of Wales. In what framework should that be done? History? Social sciences? Is the person of Diana, Princess of Wales "heavy" enough for an academic research project, for a thesis and a well-documented academic report, approved by supervisor and university? Yes, the late Margaret Thatcher is. Yes, Queen Elizabeth II is. Two ladies with direct political, social and historical influence which gives any student loads of data and information.
I have the feeling that any student who wants to make and to uphold a thesis about Diana, will meet raised eyebrows and even negative comments because it will become commented as ultra-light and not scientifical enough. Maybe we have different 'notions' of students. Maybe at secondary education level, studies about the life of Diana are acceptable for a starter.