I am also a Dungeon Master (DM), that’s the person who creates the world that the players explore. As DM I also have to create the story, explain to the players what their characters are seeing, improvise and act out all the Non-Player-Characters (NPCs) who interact with the players’ characters. I have to ensure continuity of the story and the world. Since games are usually set in Fantasy type realms, easiest described as sort of medieval, I can’t let a player suddenly have their character pull out a mobile phone to use. Except that, actually, I can let them do that if I want, since I’m the one who created the world, so in one way I can do what I want. But my players will soon get unhappy with me if I am too inconsistent. Or if I suddenly have one of the monsters, that the players are fighting, have a weapon that it didn’t have at the start of the fight. So, consistency and continuity matter.