If your campaign begins in a city on the south coast of a large continent, and you've painstakingly mapped the continent for thousands of miles to the north, east, and west, you can guarantee that the first thing your players will do is acquire a ship.
And if you map the ocean, its islands, and all the lands beyond, they'll head underground.
And if you create comprehensive maps of the subterranean system of caverns, tunnels, and lairs that underlies the entire world, they'll find a way to head into space. Even if it's a fantasy campaign.
Anakin: I've uncovered a lead on General Grievous. Palpatine sent a signal to try to reason with him and Grievous responded. He's on Utapau.
Obi-Wan: Good work Anakin!
Obi-Wan: We can go straight there and arrest him.
Anakin: I should stay here to keep an eye on Palpatine and the Council. There are strange things going on.
Obi-Wan: Hmmm. Splitting the party again. That always works well.
GM: Frankly, I'm surprised you all stayed on the same planet this long.
GM: Okay, let's break for tonight. I have a whole planet to map.