Uh, aren't hazards/risk part of what makes mountain biking fun? It's the pointless hazards that serve no purpose that can be done away with without taking away from the overall experience. Perfect example of the difference between the two is the "teepee" trees toward the end of Maybury. That is a hazard which adds to the Maybury experience, and almost everyone who rides Maybury knows exactly what it is and works to figure out the best way through without stopping and dismounting. The tree mentioned above is a hazard that adds nothing but the risk of a concussion, IMO.
Just out of curiosity, why do you find empty trails preferable?
"It is a tragedy of the world that a man does not know what he does not know. And the less a man knows, the more sure he is that he knows everything."