Some games, including most Final Fantasies, eventually open up with a complete world map that comprises the entire surface of the planet. When you think about this realistically, especially when you start flying your airship around the entire planet in a matter of seconds, you realize how ridiculously tiny this planet must be. In response to that, some games retain realism by not pretending to give you a full world, but only a few regions on what is presumably a vastly larger world map that you never get to see (FF12, Chrono Cross, etc.)
Which way would you rather have it? Do you like having the freedom to see the whole world, even if that world is unrealistically small in scope, or would you rather be constrained to a small area and never get to see the full enormous world?