We all know that Humans and Elves have always been the two most popular races in the game for decades... and more often than not the Half-Elf has been better mechanically than the Elf, which is why so many players often went in that direction. They wanted to be elves, but the H-E was just a better mechanical choice. I mean just take a look at the multiclassing options available in 2E-- Half-Elf could almost take every single option whereas the other races only could get a few. So we as players were trained to think of the Half-Elf as the most varied species option available. No matter the direction we wanted to go, the Half-Elf could take us there.
Even in 5E14, the Half-Elf gain +2 / +1 / +1 to their ability scores, which is one point better than almost every other species that gets +2 / +1 (and the H-E's two +1s can be in any ability score they want, making them even more varied)... they get the Darkvision and Fey Ancestry of the Elf (which keeps them in the Elf family of most popular species in the game)... and you get two free Skills (which many players again feel make them the species able to be the most varied of characters). It also doesn't hurt that their +2 in is CHA, which is the prime score for 3 different classes in the game.
Half-Elves mechanically were almost always top tier-- no matter what of kind of PC you were playing, it was always one of the strongest choices. And so if BG3 used the 5E14 rules for the Half-Elf, it wouldn't surprise me at all that they were popular in that game too.
Now does that mean they should remain in 5E24? To me that's debatable, because I happen to agree with a lot of the reasons why they might get removed... but I'm also completely okay if WotC decides to put a rules block for Multi-Species rules that allow players to mix and match some species features the same way they have Multi-Classing rules that do the same. It's a minor bone that I don't see any reason not to throw to people. That way the Half-Elf and Half-Orc stans can still have those options available to them... but all the other players who might want Dwarf/Gnomes, Halfling/Goblins, or Aasimar/Tieflings can have a mechanical system to generate them as well and go along with their narrative decisions.
But whether or not WotC makes it for the 5E24 book though I guess we will have to wait and see.
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