I always wondered about that myself. I mean just look what the new editions do with half-orcs.
To be honest, I like the steeper XP curve of older editions in general. It seems in newer versions the characters advance so quickly..and the XP dealt out even-handed regardless of individual player merit so the whole party levels up at the same time just smack of what they call "social promotion" in public schools.
Right now, our party ranges from 1st level hirelings to 3rd level PCs to 5th level PCs. The added issue of burdening the higher-level characters with protecting the lower level characters gives the game more gritty role-playing oomph.

My gaming blog