It’s not so much content (at least not yet at least) as it is balance and feedback. The problem with trying to self-study is that you don’t have anyone to go to for advice or feedback on how to dynamically plan your study times. If you are completely alone (as I am) sometimes you feel dumb and slow because you aren’t certain how fast you should be progressing, or if you’re attempting to learn information without having knowledge of the prerequisites e.t.c. It’s also very discouraging when there’s no one to comment on your progress.