It’s okay if “Daddy” doesn’t work for you. I caution against judging those for whom it does work. I can tell you that using the term “Daddy” in bed generally has nothing to do with one’s father.
Judging anyone for their sexual proclivities, as long as they’re engaging in them with consenting, uncoerced, adult partners, is a slippery slope toward puritanical intolerance of personal variations in sexual expression.
There are a myriad of drivers for individual sexual behaviors/fetishes/kink, none of which we have any business making morality judgements on. We all have different preferences and things that push our buttons. Consent is key and, if you have that, why pass judgement on someone else’s sexual desires?
You do you and yours (pun intended), Daddys and Baby Girls can do each other.