Tried LU playthrough, glorius liberal materialist human union, which sees every new species as equal part in grand mosaic of the universe.
Everything went pretty well, as I managed to get some good and cheap researchers and workers with similar views from unhappy warmongering shitholes, so economy and research skyrocketed.
But then started immigration of religious militaristic rapid breeding bugs, which make everyone around them unhappy.
Then said bugs get unhappy because everyone around them is not religious enough. Borders cant be closed, goverment is forced to spend all political influence on bribing bugs leaders, because immigrants start blowing up my food producing buildings and cause even more rage with starting starvation, plan of supressing information via degree to stop ethics divergence does not work out, as with not enough influence your degrees stop working. And it is totally impossible to change any damn policies, because of 10 years waiting period.
Meanwhile one of shitholes I accepted immigrants earlier rightfully liberates planet with grand part of LU industry and their industrious awesome avian ex-citizens, which immigrated to me earlier, the invasion was so swift, that it looked like AI prepared specially for this day. Bugs elect their own president, who has food production bonus, so starting human population begins leaving due to being unhappy with being overwhelmed by religious insects and bugs use food surplus to reproduce even more on my capital.
To finish that on the last remaining noncapital world insectoid separatists liberate themself from my ,, opression "( u wot, like I was liberal island of freedom, science and prosperity in sea of militarist underdeveloped religious unhappy shitholes with slavery before you guys started immigrating, then you ruined everything, but I am still guilty somehow?)
So ends liberal union gaming experience.
Imperium policies worked waaay better.