MarkB
Legend
Why would they need to? It's a whole planet. Just because they have a singular focus doesn't mean they necessarily lack all the skillsets and resources to grow their society along with the population, or even if they do, there are always droids to put in the work.There is no way that the settlement on At-Attin is thousands of years old. You could not keep population growth in check for that long.
Having a mixture of species probably helps, too - smaller pool of potential partners for each species, and since cross-species romance seems accepted (and presumably doesn't lead to offspring) that would also slow things down.