Half Elves… wait, what? Why would that exist as a race? That’s not a race. Just play a human or an elf and write it into your backstory. Maybe this could be a proficiency.
The only way in which half-elves really work as a race, in my opinion, is when they have their own culture and society.
They may have, in the distant past, been born of the merger of humans and elves, but now they’re their own thing.
(I also don’t hate them in Dark Sun, although everyone in the setting does.)