Ships travelling through hyperspace are not immune to the influences of the normal space in between. Gravitational effects from stars, planets, black holes, and other phenomena would have an effect on the ships path. For example, a ship traveling too close to a black hole, supernova or star would be dragged out of hyperspace back into normal space, rapidly ending their existence as they were inevitably dragged into it.

Also, a ships destination was likely to be near a planet. One wouldn't want to emerge to close, or even within, the planets sphere of influence either. Add to that the fact that all of these objects are constantly moving at great speeds in different directions.

So while space is vast and perhaps largely empty, following a course across a great distance, trying to hit a moving target, with thousands or millions or billions of moving targets in between, would inevitably require calculating a path before you depart.

Ships travelling through hyperspace are not immune to the influences of the normal space in between. Gravitational effects from stars, planets, black holes, and other phenomena would have an effect on the ships path. For example, a ship traveling too close to a black hole, supernova or star would be dragged out of hyperspace back into normal space, rapidly ending their existence as they were inevitably dragged into it.

Also, a ships destination was likely to be near a planet. One wouldn't want to emerge too close, or even within, the planets sphere of influence either. Add to that the fact that all of these objects are constantly moving at great speeds in different directions.

So while space is vast and perhaps largely empty, following a course across a great distance, trying to hit a target moving in a random direction at thousands of kilometers per second, with thousands or millions or billions of moving targets in between, would inevitably require calculating a path before you depart.