I love my iPad but if I had to use it as my primary tool for completing schoolwork and taking lessons, I would lose my mind.
This one is a bit of a no-brainer. There is the keyboard, the trackpad, the cost, and the screen-size. Also many sites require such niceties such as right clicking, or click and dragging.
But what is even more silly is when Microsoft pathetically tries to strongarm a school system into using its wayyyyy expensive surface technology. It is not only expensive on a per unit basis but is used by Microsoft to engage their whole licensing nightmare engine with one upsell after another of enterprise crap.
So while any school system that gets iPads is just wasting its money, any school people who get the surface should be fired for wasteful incompetence.