All sorts of reasons exist to not duplicate school. Your own teen’s experiences (and possibly yours too!) have probably led you to explore this option of unschooling. Yes, it’s considered a pretty non-traditional or unconventional approach to educating children – but only during “the school years.”
For some, unschooling makes perfect sense. Learning what you want, when you want, and staying with it until you’re no longer interested – or something else beckons your curiosity. People who have a natural tendency to want to know more usually fall into unschooling easily.