>>11401710When all those "citizens" are not squishy, fragile pink slime, but are instead cybernetic post-humans who can handle the vacuum of space just fine and simply hibernate for the millennia-long voyages through the stars like it was no big deal. When you're functionally immortal, what's a 20,000 year nap really mean to you?
No reason to go actively hunting for Earthlike planets, aside from the minority of cybernetics who experience a sense of sentimentality towards the pink slime that they all grew out of, and thought it would be fun to grow more on another planet which happens to be suitable for them, like a child playing with an ant farm. Meanwhile, the ones who are more ambitiously minded are making a bee-line for the more mineral and energy-dense portions of the galactic core, perhaps merging with all the other forms of cybernetic post-life that arose from aliens in the process