Uh-huh... and I guess because of Hellboy II, Elves must be unplayable. Not that anyone would want to play one given the rules made for them in the Harry Potter series. And because of Elder Scrolls, Dwarves must be unplayable-- after all, they are extinct. And since Halflings don't exist in WarCraft, which is all the better for it, I guess they must be unplayable too.
In fact, after seeing Game of Thrones, anyone being anything but a human is just plain silly.
And, you know, in real life? Most common religion is one where the practitioners wear the symbol of their god's execution around their neck and use magic spells to transform bread or cookies and water or wine into his flesh and blood to ritualistically cannibalize him. So, obviously Clerics and religious practitioners shouldn't be playable.
Or.. you know... you could you know... possibly figure out how to compartmentalize one fictional world from another?