And that point would be that female characters are stuck with less potential for greatness in certain classes in a fantasy game just because a rule says so.]
Well, that's really taking things to extremes. In 1E, the maximum strength allowed a female human character is 18/01-50. That's considerable strength, and it's hardly "less potential for greatness" unless you first think that women must have strength equal to men in order to achieve greatness. I'm sure women have much more going for them than just how physically strong they are.
Its so funny because OD&D and B/X play just fine without these stat modifiers. If you happen to roll an 18 STR for your female halfling its all good and won't break the game.
The playability or brokenness of the game is really not the issue.
Equality in stat generation doesn't have to equate to a modern worldview for the campaign world.
Given the way the OP wrote it, it did.