The real issue is..
The +2 to DEX is not representative of a D&D elf if D&D elves are naturally Dexterous as the lore describes. +2 DEX isn't much mechanically.
+6 to DEX is.
The problem is representing the various races mositing in Ability Sore Adjustments would 100% lead to them being typecasted and players only running munckining power builds.
If Elves have +6 DEX, +2 INT, and -4 CON, the only elves you'd see played are powergamed bladesinger wizards and EK fighters.
We saw that in 3e.
So we have 4 choices.
- Minor fixed ASIs for show
- Minor fixed ASIs true to lore but so harsh only powergamers use these races
- Flexible ASIs and mechanical power shifted to nonASI traits
- Flexible ASIs and mechanical power lessened to nonASI traits and elves are pointy eared humans.