Before WotC decided to give all races a flex stat bonus, there wasn't a good way to make 'good sneaky/archer elves' and good magic elves with the same race; D&D had this problem for a long time. The elf/eladrin split was one way to fix it; flex stat int/dex elves is another.
I call shenanigans! Before WotC decided to give a flex stat bonus? Really?!
Sneaky archer elves were a staple of the genre...put your good stats into Dexterity (if you were playing basic/B/X/BECMI) and/or make them a thief/whatever (if you were playing 1e AD&D or further)...they'll be plenty stealthy...and with the racial +1 with bows plus whatever their Dex. bonus was for ranged weapons...um, yeah, you'd have a perfectly "sneaky archer" as you wanna be.
And "good magic elves"...Elves were designed, from Basic on to be good with magic. B/X and BECMI had elves automatically get spells..."Magic-Users" and "Elves" were the only ones who COULD use what would come to be classified as "arcane" spells. And in 1e or 2e AD&D, elves could multiclass Magic-user with anything (I really can't speak to 3e or later).
The elf/eladrin split was one way to fix it; flex stat int/dex elves is another.
There was nothing to fix!!! Play a 'high elf", which orignally was the ONLY elf PC allowed...then after UA, play a "wood elf" if you want the sneaky archer guy.
Elf/Eladrin split was NOTHING but a redefining of something that needed NO redefining....categorizing for the sake of categorizing...or, put another way, making something "different" for the sake of being "different"...which DOES NOT automatically translate into "better."
"Let's give the haughty magicy elves a different name." "Ok, let's call them "eladrin"... Ooooo aaaahhhh...."OH! AND, they have green pupil-less eyes." REALLY!?!? WOW! Ooooo...aaaaahhhh.
Stuff and nonsense. Completely unnecessary.
Just my 2 coppers. An "eladrin" will never appear in any game of mine.,,and before the onslaught begins about why they are so great, that's my prerogative...no eladrin in my game. period. You don't have to play in it, not your concern.
Play the game you like, have fun and happy elfing.
--SD