Most 4km maps are extremely hard to take the map overview image of, especially maps that have lots of trees. Even 2km maps can be difficult depending on the complexity of the map. But after applying lots of tweaks, turning stuff off (like overgrowth) until you're ready to take the shot, and having done it lots of times before, it gets easier. Still, it's pretty time consuming.
As for the actual map overviews, they also aren't that simple to do, especially when one map has many layers. I actually recently made a program to help gather the required information to make the map overviews, which has drastically reduced the time required to make them, but it still takes quite some time for all the maps in PR, and all their many, many layers. There's 139 individual map overviews in 0.96...
Actually, from my experience, taking load background shots is more difficult. Either the map is really detailed, like this map, or there's not much detail at all. In both cases, it can be quite difficult to find areas that provide a good image. For Shijia's load backgrounds, I was flying around for at least an hour, just to take 4 shots... Then there's the edits required to the shots, etc...
It's a lot more difficult and time consuming than most people think. Quite a lot of thought and detail goes into each and every map overview, and more so, every load background. It's not as simple as taking a few shots, pressing a few buttons, and job done
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