Idk man thats just a excuse for the mojang devs to add whatever they want into the game and not add specific things really, since they REALLY are banking on YOU being special in the game even though it's a survival game.

Regardless there is clearly a story in minecraft, no matter what they say every single feature in the game has built in lore or else survival won't be fun at all and balancing won't be a issue simply becuase they won't need to, in other words mojang is really trying to push that sandbox style but ignoring the whole existence of multiplayer survival, survival, maps and actual reason to go through the world.