30 pages on world building
25 pages on the planes
55 pages on making adventures/NPCs
95 pages of magic items
25 pages on running the game
25 pages of optional rules
10 pages of random dungeon design
For a game built on "making the game your own" and "playing how you want", 25 pages seems pretty tiny. Like super tiny. I hope there's more customization content spread out over the rest of the book.
And with 150 pages dedicated to running the game, making adventures, and magic items in the DMG, you think they could devote more than 5 pages to that subject in the Basic rules.