Ath'kethin
Elder Thing
I have used a standard array for ability scores and no ASIs for over twenty years now, across three editions of D&D (2nd, 3.x, and 5th) and probably a dozen other games. The only impact I've seen is a massive reduction in gamist thinking in character creation, or trying to justify a character concept as Race X because Race X will give a beneficial boost to a given stat.
I didn't like the ASIs then and I don't like ASIs now. Describe elves as quicker and smarter than others, fine. But give players the choice to lean into or away from that trope.
I didn't like the ASIs then and I don't like ASIs now. Describe elves as quicker and smarter than others, fine. But give players the choice to lean into or away from that trope.