Not to mention they forgot making any use out of any Diplomat skills from the SPECIAL system. Or that the Deathclaws grew fur, or quite a few other things.
Though, when did Deathclaws convert from a Patriarchal to a Matriarchal community? In the original Fallout, you have the egg-laying 'Queen' in the basement of the Deathclaw lair (though it's not much of a community). In Fallout 2, you have a 'Queen' nesting in the arms locker of Vault 13, the center-point of their community. In Fallout: Tactics, you have the 'Queen' captured by the Beastmen.