I still want to make the ethics more distinct, but the Psionics/AI Rights and Ascension paths seems to be the sort of restrictions that really chafe on people's ability to build the empires they want, so I decided to walk back some of the ethics restrictions.
I like that. I think it's best if an ethic gives a distinct perspective on gameplay, but does not lock specific gameplay entirely.
So a pacifist for example may be bad at fighting and have specific conditions or problems with unrest, but still has to be able to fight in a viable manner.