The prevailing mentality is to cut recent deadfalls out of the way, to prevent bypasses being constructed around obstacles. Keeping the trail "open" is more important in most people's mind, than causing detours, bypasses and corridor damage.
If you talk with DNR folks very often, the mindset I've gotten from them is along these lines: The existing corridor is considered already "lost" to timber harvesting. Ergo, keep the trail where it is, so that the remaining forrest is harvestable. The exceptions arise when sedimentary damage (washout) threaten nearby streams. Since most of the fun trails are on hills, or hillsides, teh washouts can travel for noticable lenghts. Therefore DNR really doesn't like erossion concerns. When washouts are too extreme, then DNR wants either the trail moved, bridged, or shut down.
The problem is exaccerbated due to the huge difference in vehicle capability. Since a realitively stock rig has 29 inch tall tires, a modified, late model rig may come with 31s or 32s, and a lifted rig may have 33s. Then you get built rigs with 36s, 37s, 39s, 42s... etc you have a huge disparity in capability. What I easily climb over with my locked up on 37s may become an impassible obsticle for someone in a stock TJ.
So, get used to having trees cut out of the way.
I'm not for it. But it's better to keep the trails open than to create unneeded bypasses