I have a question regarding the new commonwealth system.  When I create a commonwealth, the conquest victory condition now adds that new "race" as another number (of races) to be defeated in order to achieve conquest victory. 
If that is not a bug, then why would I ever want to create a commonwealth if I have to just go back and reconquer my old planets?  Maybe I'm missing something but as soon as I saw this in-game I stopped so that I could ask...