I just want to remind ya that the racial bonuses never made sense in the first place. If they did humans, the best wizard and sorcerer race in the lore would have a +2 int and +2 cha.
Theres other weird stuff like gith not getting +2 int eventhough they are multidimensional raiders who love to consume new knowledge.
I'm not sure you're trying hard enough to argue your point in good faith.
For instance most of those wizards and sorcerers are far into their adventuring careers, and many of those careers span the editions.
What the appropriate stat modifiers for Githyanki are can't really be determined until psionics has rules again. Should they get +1 to intelligence, or charisma? Maybe Wisdom, maybe just the Githzerai get wisdom, from the eons conquering Limbo, you know, the way magic and your environment can determine your physical and mental development.
