There isn't much point having a huge galaxy to explore.
At Warp 8, they can only travel 2,560 light years in a 5 year mission.
They could never reach the Gamma or Delta quadrants (without going through wormholes) - plus, there wouldn't be much point, considering the distance to the Bajoran wormhole.
So, there isn't much point in having an in-game galaxy section of more than 3,000 x 3,000 light years.
At Warp 8, they can only travel 2,560 light years in a 5 year mission.
They could never reach the Gamma or Delta quadrants (without going through wormholes) - plus, there wouldn't be much point, considering the distance to the Bajoran wormhole.
So, there isn't much point in having an in-game galaxy section of more than 3,000 x 3,000 light years.