Alan, I actually like the challenge, I just want to see somebody do it as a way to see how I can improve and inspiration to one day reach that level where I can on a consistent basis. It is a black trail, after all. I was sad when they filled in some of the harder root sections on inner loch ness and baby nessie, because it made them so much less challenging. (these are intermediate trails, however) It is tough to find a balance between erosion and challenge, our trail maintenance folks do a good job of having multiple different areas for all different skill levels.
Kinda like why I still ride a hardtail and some people ride SS rigids, I like the challenge to kep it interesting, and if you don't feel sore after absorbing all the roots and rocks it doesn't feel like real mountain biking. I ride for fun!
A wall ride would be sweet though!