I would like to see some people demonstrate how powerful seemingly useless effects are when they are combined. Take Caustics and Wave World for example. Apart from each other they're fairly useless, but, when used together, you can produce some really amazing stuff!
In the same vein as Szalam's comments, consider this:
In their print-based AE training series, Chris and Trish Meyer include several "Hidden Gems" -- features that are valuable, but are often overlooked. You could put out an entire series of hidden gems.
Then ponder just how confusing the AE user interface is! It really hasn't changed all that for more than 20 years, yet new features somehow keep getting shoehorned in. Some features move around on the interface from version to version. It would be good to have explainer videos describing the logic behind the layout of the interface... good luck with that one!
I haven't spent any time on Twitch and don't know much about it but isn't it only live? Clicking on the link at various times during the day I just get live feeds or off the air. I'm not sure how much value a live feed has for me because my days are usually booked and my free time is precious.
I also find much more value in edited presentations than live ones because the tend to be more to the point. There is a lot of value in a live presentation when you can ask questions and take notes. I'm not trying to be critical of the effort, just wondering how the Twitch channel is supposed to work and be valuable to the most users.
Good luck on wearing yourself out answering beginner questions all day from over-ambitious teenagers. In the end they're probably the only ones that care to even put up with it. Otherwise I'm with Rick - even doing an edited demo/ tutorial is difficult enough to make comprehensive and thorough, so what do you hope to achieve? This latest move is just another attempt of Adobe to desperately look hip and half a year down the line it will either be the ever same repetitive content or nobody cares anymore. It will be the same like with Adobe TV - before forcing it down everyone's throat by video-fying the online help system, nobody seriously watched it...