This seems to me to be yet another flawed reasoning from the WT. God is supposed to be JW's "father". It always seemed a bit strange even when I was mentally in, the argument they used to support using the name Jehovah. They argue that its impersonal to call someone by their title and not their name. Ok ill give them that. But refering to and praying to your heavenly father should be more personal than that.
With a human father, most would never dream of saying; hey Fred, how have you been? as an example. Most say dad or father. Jesus always called him Father and instructed his followers to pray referring to God as Father. It seems far more intimate to refer to God as our heavenly Father as opposed to praying to God by his first name as it were.
I welcome your thoughts, has anyone else ever thought of this too?