My opinion is that mapmakers are cooperating with the Forest Service plan to decommission many roads. I was out recently and found that the older the map, the more accurate the roads. This applied to both paper and electronic mapping.
I also noted on one of the newest paper maps from National Geographic that they had made a couple of mistakes in "erasing" old roads, leaving a tiny fragment left hanging in what otherwise appeared to be a roadless section. While in that section using an old version of Garmin Topo, we found the complete road and navigated using that. The same road partially appeared on a slightly older Green Trails map.
Could be I'm wrong, of course. Certainly added to the adventure.