I only dug into this because people were raving about it. Never played D&D, but it did remind me of those text adventure games I played as a kid. When humans p

I only dug into this because people were raving about it. Never played D&D, but it did remind me of those text adventure games I played as a kid. When humans play D&D as the game progresses, are the rules of the world that people establish supposed to be internally consistent and is there a planned plot arc? Can you say there's no gravity and then later drop your sword?