In practice, pretty much all planets in most Space Operas are effectively just a single town, that only gets visited to have dealings with one single group.
Having just half a dozen worlds makes it much more feasible to develop actual societies with internal dynamics instead of just one faction, and of course ecosystems outside the main settlement.
But it's still enough to have plenty of regular space travel and let the spaceships have a prominent presence.
It's the perfect middle ground.



