If Nexon knew how to properly design maps and didn't always have 1 map being 10x better than every other one in the area then it wouldn't be a problem.
The legion system isn't designed to be maxed out. The highest rank is a throwaway for the noli-- seriously commited. It's perfectly fine that the highest rank isn't really attainable. Free damage is free damage. Your complaint could be summed up that you can't get even more free damage out of a free damage system.