/Against unlocking race-exclusive traits (Like Leadership, etc.) for use with Aliens, or unlocking race-specific (Like the Accuracy boosting space trait not available to Aliens). If every Alien could choose 1 (Or 1 or more?) canon race-exclusive traits, then there's no incentive to play anything but Aliens. The biggest plus to base and unlockable races is exclusive traits, and Aliens not having access to every trait. If Aliens could choose exclusive race traits or traits specific to a race, there's no advantage to being an non-Alien race anymore. The point of all unlocked race costume options being unlocked for Aliens but keeping the traits as is now is so that Aliens have no gameplay advantages over canon races and remain almost purely aesthetic. Although there is a degree of possible "min/max" trait options for choosing an Alien over a canon race, there being optional exclusive traits being and 1 exclusive required trait per canon race that isn't available to Aliens prevent Aliens having a clear gameplay advantage. If race-exclusive or race-specific traits are allowed to Aliens, Aliens cease being a mostly cosmetic option.
I disagree with you. The Star Trek Universe and its parallel dimensions are vast places, and there are going to be abilities which are shared across the vast breadth of extant species. Therefore, *all* species traits should be available once that species is unlocked via that species being purchased in the C-Store or a Booster Pack code being input on our Account page.
As for your argument that people will no longer want to play the 'real' species when they can have a facsimile, I would point out that there are *many* diehard fans of specific species who will continue to play their favorite(s).