I am always clamoring for more DM support in 5E, and this is absolutely not why. The rules of 5E are simple, the math is transparent and for the most part it is easy to come up with stuff that is "balanced" when it comes to a new monster ability, a magic item or some terrain effect. The reason why 5E needs better DM support is because without it the game gets stuck in the rut of being a game about people that go on adventures and punch stuff and it's frankly not great at that. DM books that life up the exploration and social pillars, that allow PCs to rule nations and lead armies, that make it fun to craft artifacts or work toward immortality, expand the game into spaces that are fun nad interesting and frankly better than another romp through a forest and dungeon to fight a mid level boss to get a clue to the next forest and dungeon where the big boss lives. THAT's why 5E needs DM support -- because DM support expands the game and the game is better when it is about more than fighting bad guys.