evidently you can change a map's layout so that you correct flaws before they become visible. sure there are flow flaws that later become obvious when testing, but we're not talking about those now; it's just what you can do within the layout.
i also realized i didnt comment on the images, which i think for the most are hard to tell what is "above" and "below" and that is confusing me. what i usually do is a topographic view of the level so that you can easy tell what is where and how. for the rest of the article, you could also elaborate much more on how a multiplayer/singleplayer design is made in the first place (and comment on the evolution of that).