Crusty Old Meatwad (he/him)
Its not the kin I see as a potential problem for some people here, its the elf. It implies the same thing as half-elf: that the human part is assumed, and we have to call out the other part.
Agreed it's why I earlier mentioned I prefer Feykin. That makes more sense as "human part assumed" as it's any kind of relation to any kind of Fey that's come through to alter something, with the something being human. But people didn't seem to like that.