My grimoire score is low but I've been playing since day 1 and there are people who have never completed a single raid that have higher G scores than me. Just because people don't feel like scouring every map to find a dead ghost doesn't mean they aren't experienced. It just means while you were out looking for ghosts they were running raids and crucible and actually becoming a better player in skill rather than on paper. With that being said, the sub hasn't been touched by anyone outside of Bungie yet so this post is all speculation on both sides of the argument.