Emerikol
Legend
That is because there really is only one race on this planet. The human race. Whereas depending on the backstory, most fantasy realms present Elves as a real different race. They are not the same as humans. Same for all the others.My oldest son is mixed race. The idea that he's half anything is insulting, tbh. Regardless of anything else, the terminology is problematic. I imagine someone who is mixed race might* be really turned off to read a book with "half" being part of the description of multi-racial humanoids
*I say might, because I know mixed race people who weren't bothered, and those who were. Individuals being individual and all.
So I agree with you on the half part for humans. We are humans through and through. In a fantasy realm where there are multiple intelligent races, and they are real races, it seems fine to say half human half alien where alien is whatever other race you want to pick.