I approve of more nuance, but I think I'm going to reluctantly admit I prefer appearance to be purely cosmetic. For me, figuring out what these fanatically xenophobic collective agrarian tundra-dwelling flying monkeys are like is part of the appeal, and giving them an energy boost or tendency to form federations feels like it's bolting two options together rather than making a previously meaningless option important.
Same. I think that while they could stand to have more personality, that sort of personality could more effectively come from traits, the existing AI personality types, governments, and that sort.
For instance, if a reptilian species has an arctic preference and nomadic traits, why should it be hard-coded to go for densely-populated hot planets just because it has a reptilian picture? Personality types are already defined based on ethos, traits, and government, but a lot of what they need is more character and much more obviously-distinct play styles when you deal with them. Apart from a handful of stand-out personalities (say, Fanatical Purifiers or Federation Builders), they tend to be not particularly distinct.
Actually, it's interesting, because AI personality seems to define much more than I thought. Even preferred weapons types are a part of AI personality. It's just that not a lot of this is very obvious to the player, so it all blends into a bit of a grey mush. There are some really rare personality types, apparently (
EDIT: Ah, saw the above. I thought you were saying that portraits should act in addition to traits rather than replacing traits with a preferred set. That still seems kind of unnecessary to me, though, because it doesn't really solve the issue. That is, what makes one Hive Mind different from another Hive Mind, or either distinct from a Fanatical Purifier? I mean, I can list off specs like how a Hive Mind will spend 0.9x default on the military while a Purifier will spend 1.2x, or that a Hive Mind will favor a bit more armor while a Purifier favors a bit more shields, but that's not really all that much when you're looking at a galaxy map. If your bugs are going to be predisposed to Hive Minds and your Avians to Purifiers (f'rex), that still doesn't change how they act or how they deal with you; it's only an extra limiting factor on the generated empires.