Well, my expanation is that it's there in order to not force people to RP something they don't want to / aren't used to relate to. Humans, dwarves and elves are traditional fantasy, and as such are generally known. IOW, without them, PS would lose play value. OTOH, things like dragons are in no way a requirement, and "Gobble" does not equal "Goblin". Regardless, they represent concepts that are not really well defined anyway, though the name creates certain expectations and associations, which are neither required nor necessarily beneficial to PS. That's why they are explicitely avoided, while the general, broad concepts are not. Pterosaurs, for example, certainly match some definitions of "dragons". Yet, not naming them "dragons" frees everyone from the urge to save princesses or little villages from them all the time. It's also cheaper for the owners of a pterosaur, since they don't need to continually re-purchase them and maintain a pile of valuables for them to rest on.
Something else came to my mind WRT the original tpoic: the terms "male" and "female" are also a good thing to use, in conjunction with <race> or standalone. Especially Enkidukai would likely use these terms instead of woman and man, given that several Enkidukai are RP'd with, partially pronounced, similarity to non-sentient felines, usually cats.
I'd be careful when calling an Enkidukai "cat", because it is not yet known if cats exist in Yliakum. If they do, though, then Enkidukai will probably be similarly offended as humans would be when called "monkey". It is, however, possibly that the offending meaning is weaker than IRL, and it usually is RP'd weaker (i.e., normally humorous and only offensive in an already negative context).
