I definitely agree, but I do think for a lot of subjects schools can provide benefits that are hard or impossible to find on your own, such as access to equipment and facilities, dialogue with peers and teachers, group activities, objective measurements of your progress etc.
Edit: the other commenter's example is a good one - you can certainly study medicine by yourself, but without access to labs, cadavers, and clinical training you'd have a tough time.
Edit: the other commenter's example is a good one - you can certainly study medicine by yourself, but without access to labs, cadavers, and clinical training you'd have a tough time.