The issue of instilling an inspiration to consider possible solutions beyond those presented within the context of a single lesson in a strictly asynchronous setting has much to do with the level of engagement of the student in the comfort of his/her own environment. You are a guest in their house presenting yourself through your own style in a manner that the student feels is helping them. The feedback element is pretty much at the discretion of the student and not always easily shared with the instructor as the two are selectively engaged at least from the student's POV.