People who "successfully" teach themselves are overrated (good examples being Trump or Zuckerberg). They might be successful in a few dimensions (purely out of self discipline and above avg energy levels) but totally miseducated in many others because people don't know what they don't know. Without the right guides, feedback processes, environment and time(lots of time) most people usually end up taking all kinds of wrong turns.

Education not something intuitive, even if there are many paths. If it was we would just be leaving kids in libraries.