It wasn't an example meant to reflect real characters. It was meant to show that the argument presented creates a clear logical contradiction, that extremely weak mental stats provide absolutely no inhibition whatsoever, while identical weak physical stats cause crippling problems the character cannot escape from.
I agree that few players would ever want such a thing. But the net result is that, to use a slightly more realistic character, someone with straight 7s in Int/Wis/Cha can be just as judicious and perceptive as a character with 20 Wis, just as sharp and incisive as a character with 20 Int, and just as compelling and convincing as a character with 20 Charisma, just so long as the player is able to do those things....while physical stats get no such leeway.