Nothing beats hands-on experience. Even if you are sitting directly in front of an instructor, nothing beats an instructor showing how to do something, and then handing the student a tree and saying "now show me how you do it."
One way that I am trying to really leverage online instruction is to watch a video, and then immediately go do the same work on one of my trees. In the case of Mirai, which has developed a pretty significant catalog of back content, I am actually starting to do this in reverse... find a tree on my bench that needs work, think about what I would do, and then try to find a Mirai video that covers the content. Seems like it takes me about three times of watching the same video (over the course of months or years) until I really absorb everything that is said and done.
One thing I will just add to the whole "public demonstration" issue. One format that I find particularly effective is to run several demos next to each other at the same time. That way one instructor can talk for a bit about their tree and what they are doing... and then be allowed to work in solitude for a bit while another instructor takes the mike. They use this format at the Bonsaiathon in Pasadena every year, with advanced instructors (and a relatively advanced audience) and it seems to work well.
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