> We have people who study at university X, do their exams at university X, do their Ph.D. at university X under the same professors they always knew, then become postdocs working for their former supervisors and being exploited by them

Independent of every other point, this is in my point of view a real problem. It happens so often and I don't understand why there's often no law that at least a postdoc at another institution has to be done.