I am more of a visual learner but I completely agree about tightly-edited content. When I record video courses, I spend most of my time editing and rephrasing to make it shorter.
I've been thinking about feedback on incorrect answers and providing hints when the learner is stuck. I want to try and make this dynamic based on what the learner tries. Of course there are endless possibilities there, but at least if they do something that's known to be bad, it's a good opportunity to teach them why not to do so.