I dunno, Traveller's always done well with a pastiche of Niven, Asimov, Piper, and Drake.
I mean, default relationships for races can be pretty simple. Fur suits are basically sf's elves, dwarves, and orcs. Dogs and cats don't get on well, the bugs are scary and so on.
The problem with the Privateers races is that they are so specialized and powerful that it's hard to drop them into other settings.
I like the Privateers setting and feel it got a bad rap from a certain narrow range of fans who want only hard sf in the strictest sense. A while back Mega Minis did a limited edition run of 200 blister packs of Vargr (dog man pirates) for Traveller, they sold out in a week. Then they did K'kree (zealous vegetarian centaurs) and newts (lizard beaurcrats) and neither of those has sold out in the last years. So much for the vocal hard sf crowd.