How do you prevent an advisor from "forgetting" about your work and "handing" it over to another student? It is a gross break of confidence and professionalism from my perspective.
Betts is a good case of this, but it happens. Would it be better for advisors to tell their students to develop their own ideas rather than coming to office hours without any? If a student doesn't have their own ideas, isn't it better to tell them to reconsider graduate school?