I think this is less Organic vs Google than OpenStreetMap's data set vs Google's. I don't know why Google does so much worse with trails than OSM, but it really does.
I expect that Google never saw a market in trail mapping. I also assume no Google employee took an interest in trails as a 10% project. Google Maps doesn't really do much for topography either.
Google Earth can be good for trail mapping, but that has basically atrophied since it was acquired from Keyhole.
So few people hike these trails that I do not believe they were entered one by one. The one "trail" I hiked that was entered by someone I deleted later that day, because it should not have been shown as a trail.