Diego :
From what I see in the comments, many have a low level of stellaris or practically played very little, immigration is bad in the game and I will explain why there are several things to keep in mind in the game attraction of empire ethics,habitability,ascensions,stability,happiness,unity,crime,inmigration treaty and a lot more stuff
governing ethics attraction why It is important
happiness and stability , populations that share your empire's ethics are happier, happiness means more stability,unity and work efficiency
factions and internal politics high governing ethics attraction strengthens factions aligned with your ethics, making it easier to pass reforms or shift government policies, specific bonuses certain traditions, edicts, or traits boost this attraction, reinforcing ideological control
In other words, high governing ethics attraction keeps your empire cohesive, reduces discontent, and improves political efficiency, while low attraction can lead to instability and the rise of opposing factions,alien species usually have attractions of different ethics than those of your empire, creating factions opposed to your ideology ,empire if they grow in number they will give internal instability, possible rebellions,civil war, less happiness, less stability, less unity, less production of work, more crime, they basically kill you from inside.Habitability why its important,
low habitability of the species in the planet increases the base upkeep of population and the amount of housing and amenities they require, which reduces their growth, their efficiency, they consume more resources to produce less,the funniest thing is that empires that are xenophobic or that are genetically "Pure" have more population growth, better performance, stability etc more than those with immigration, xenophilia, an example of biological ascension if you choose the "Purity" path.If you need immigration deals to fill out your jobs, you are playing stellaris like a newbie or you simply don't know all of these factors and you need to learn more the game.
There are many more reasons why immigration is bad on stellaris but this comment is already too long
2026-04-14 10:11:04