True, the manual of your mobile phone contains a lot of information about how to use that device. But are you going to learn to use it by reading through this long-winding technical gibberish? Most likely not; Most people will experiment and explore what they can do by themselves, and possibly ask their friends in their social network.
For some reason most elearning courses still resemble manuals rather than social learning environments that allow students to explore subjects and learn what is meaningful to them.
Cathy Moore has shared a presentation that contains a lot of very useful hands-on tips and encourages course authors and educators to give their learners what they want: