I totally agree, preparation is elementary and wanting to be spoon-fed is unprofessional.
But what many are talking here is that as trainee you might expect more than questioning what you retained from preparation from the books and charts. You might expect knowledge and experience BEYOND that, this is what eventually brings you further and that should be provided by trainers.
This is sometimes lacking at EK and the reason is that many trainers getting into the job too early simply do not have that themselves.
That would be the responsibility of the managers in training.