I agree that these videos could be used as a tool, think of all the threads that are made called 'Became lucid but followed dream plot', 'was I lucid?', 'lucid but didn't remember my waking body', etc. that could be easily clarified with these videos.

Also, all of the lucids I've had so far I've been able to categorise with these 'layers', I also believe that Reece discusses that these layers are volatile and given to change within a single dream, (in fact I think there is a layer characterised by slipping in and out of lucidity), he also stated a disclaimer that it's not a definitive collection, I don't think anyone could compile a complete list