I started an unlimited game and I just wanted to build up my Techs like I did in the campaign. It started well enough until I realized that my researchers just weren't advancing. I gave them all they need, they were 100% satisfied but when I went to toggle their tax I noticed that even at lowest tax value it didn't say they would advance. My Ecos say that only euphoric citizen advance ... my Techs just don't).
I also have a weird proportion of 1,000 lab assistants and 4,000+ researchers ... and I shall stress this they are euphoric ... they just won't advance! What do they need to advance?