From Wiz Twitter and the Lifestream, we know that there is a level beyond Utopian called "Chemical Bliss". Pops are very happy. But also uterrly incapable of producing pracitcally anything, even food. I could see it maybe usefull for a Slaver empire, where the main pops are drugged to produce more unity.Okay how about this. Increased living standards increases consumer goods maintanence, food consumption, and happiness. Okay so all of that is true in the real world. After a certain point (High, very high, and utopia levels) the POPs get scaling negative modifiers to food, mineral (and maybe energy) output. If anything higher living standards helps with research as it gives people more time and resources to go studying all these minors things people get grants for now. How's that sound?
"If you've ever dreamed of keeping your population happy with games, drugs and anime in @StellarisGame, 1.5 has you covered."
https://twitter.com/Martin_Anward/status/824238024745779204