They proposed a device that has a stylus for input, specifically for handwritten note-taking. You don’t make a convincing case with regard to computers in general allegedly not being suited for “ordinary classroom instruction”. A computing device can be designed in such a way as to engage the (as you call them) “motor portions” of the brain and not be a distraction, don’t you think?

Or you can have a smart board? It’s hard to tell what your point is here.