Remathilis
Legend
I wonder though. Do people take races based on the race abilities or because those races appeal to them. I have a sneaking suspicion that racial mechanics are not very high up on people's list of priorities when creating a character. I might be wrong, but, it would explain why WotC is going the route they are. If people's choices of race are largely for aesthetic reasons, then, well, why bother creating a whole system for mix and match race abilties? It just makes creating a character that bit more complicated. Which, in turn makes these races less appealing.
I can make an Orc character and I have X, Y and Z abilities. Or, I can make a half-orc, half-whatever character, have to take an additional step of going through a list of abilities and make choices. I'm thinking that the added complexity isn't all that appealing.
They aren't, until they are. For example, people who want to play an aarakroca or triton are probably doing it for flight and swimming speeds . Goliaths were put in to have another "strong" species. The whole ardling thing was about people wanting animal races to be more animalistic. While I agree that most people pick for aesthetic/concept first, mechanics play a role.