The reason comes from the New York Times:
While Mr. Obama liked policy option papers that were three to six single-spaced pages, [National Security Council] staff members are now being told to keep papers to a single page, with lots of graphics and maps.
"The president likes maps," one official said.
If only think tank papers were kept to a single page, then we wouldn't have to deal with this.
Part I of "President Trump Ain't No Think Tanker" can be found here.