>* Interactivity is important in a training setting because you're learning along with others. That initial path you create in your brain is dotted with waypoints that everyone in class travels together.

I'm sorry, I'm totally lost at what this metaphor is even supposed to mean. I have no idea what the deep mental processes of my fellow students are when they are learning, even if we would talk about the material and ask questions and discuss, and I'm not even sure why I should follow the same "pathways" as them to learn to grok some concept.

Most efficient learning method I've found is to study materials on your own (be their written materials, videos, recorded lectures, though I prefer texts), try to apply it (first to some basic exercises if available, then try more independent work), and ask a more knowledgeable person questions about it when I have questions to ask. The last stage is inherently interactive, but at the first stage all and the only action that happens should be you and your brain concentrating on the material.