Sorry if this has been covered already, but it is my understanding that the TAP builders are fully on board with structures, skinnies, etc - on the condition that they are not deceptive or dangerous simply for the sake of being dangerous. As Mr. Wood has stated in his lectures / trail days, there is acceptable danger which is inherent in the difficulty of the terrain, and there is unacceptable danger where a rider could be doing everything right and still get hurt - ie. the structure breaks or is very slippery and off-camber.
The trails being TAP'd are in their first stage of revitalization - make the trail safe and make the trail sustainable. The next stage would be to add back in structures and optional lines. It is true that the level of death-defying structures will probably never return to where it was before because of land owner involvement. But do not forget this involvement is crucial to the longevity of our trails. Sacrificing some of the gnar in order to rest easy knowing these trails will be here for you next year and the year after is a small price to pay. Also, it's worth noting that the land owner concerns relate to your own safety.
I think some creativity can be brought to the table to sneak really tough lines in, they just can't be the intuitive line. Digger (and other builders) do a pretty great job at creating multi-level sections where an advanced rider could jump over a whole section, or choose a specific line to make things tough. Creating multi-faceted trails like this is the art of trail building in my opinion.
So to sum it up, the plan is not and should not be to make everything a smooth flow trail. The plan is to get the trails to a point that they require minimal maintenance, and then tackle the fun parts - and the fun parts should maximize enjoyment while minimizing unnecessary danger. This is a reality that can't be avoided now that mountain biking has grown to the level that it has. We can't fly under the radar anymore.
