- Peers that aren't just voices on an internet board
- Validation of the syllabus, and a sense of which parts are more important in the field. For instance, my econ tutor who was a famous Marxist didn't find it of high importance for me to study Marx.
- A timeline that is relatively inflexible. If you're in uni you need to learn how that proof works be the time of the exam, and you'll have to put off other things in your life. Outside of uni you can learn it today or when those things have happened.