It's just so weird, right?
Wizards of the Coast takes an elf, changes its appearance and gives it a unique ability based on its ancestral home, and everyone complains "oh yuck, another elf, get rid of it, why are there so many," etc.
Wizards of the Coast takes a tiefling, changes its appearance and gives it a unique ability based on its bloodline, and everyone complains "oh gross another tiefling, toss it in the bin, there are just too many of these," etc.
Wizards of the Coast takes a human, changes its appearance and gives it a unique ability based on an animal, and everyone exclaims in wonder "oh wow a totally unique species, such a rich contribution to my game world, why didn't they do this sooner," etc.