Take for example, what is better for the student when he's learning circuits? A single slide showing a circuit with an animated airplane zipping around? or an instructor drawing a circuit on the whiteboard explaining each leg, watching for student understanding, adjusting the rate of delivery to correspond with student reception rate, and stopping to clarify or answer any questions?
I know which is easier for the instructor - press 'Play' on the IPad, and sit back while the student is taught. Easy.
And completely f@$king useless, if your student doesn't get it right off the bat, 'cos then you'll have to go back to the white/blackboard to explain it step-by-step anyway..
It's been a while since i was an instructor, but IIRC, a blackboard and a tin model aircraft seemed to work well (at least for
ab-initio) pretty much all of the time..