I'm not against racial traits as I love the flavor it adds in games like D&D both from a gameplay and storytelling perspective. Adding racials with a tangible benefit in combat could absolutely have a negative effect however due to this game's heavy emphasis on a dps meta.

So any racial differences would have to be purely cosmetic. For example, in FFXI every race/gender combo had it's own unique stance for every weapon and a different animation for every weapon skill. I'd be all in for stuff like that as it would provide more flavor, more visual difference between players, and wouldn't have any effect on performance since it's a purely cosmetic difference.