This might depend on your view of the world. As you state autodidactism, you might view knowledge as absolute and measurable. I'd posit it might not always be

This might depend on your view of the world. As you state autodidactism, you might view knowledge as absolute and measurable. I'd posit it might not always be, and you'd miss some social aspect be that feedback to socially constructing knowledge - as well as obviously only construct knowledge within yourself and not within and among others which would be a social form of knowledge - you might not need a school for this, but by definition a form of social environment. [Feedback as both (and also separately) an accelerant to individual learning, and choosing paths of interest, is a different thing, and perhaps also worth exploring.]