None of those things require the augmented reality aspect of this: you don't need to place math and physics lessons into your local environment. They'd do just as well with VR, and indeed it doesn't sound to me like they'd do MUCH worse with just a plain old screen. What is it that you're imagining we couldn't do with a tablet that has swipe gestures to rotate the demo around all axes?

An electronics teaching kit might not work on a tablet (but would in VR), and note that any kind of really fluid manipulation of a virtual environment is going to involve a whole additional technology that gives precise locations of your hands (at least). The HoloLens allows a few simple gestures, not the ability to handle virtual objects in many degrees of freedom.