Why do Anglicans have the "give away" optional in Common Worship but obligatory in Anglican Book of Common Prayer?

Why do Anglicans have the "give away" optional in Common Worship but obligatory in Anglican Book of Common Prayer, and since when did people make the "give away" optional? It says so right here : Common Worship: > There is no mention of “giving away” in the text of the modern service > but it is included in the notes which may be why your Vicar has missed > it. Anglican Book of Common Prayer: > *Then shall the Minister say,* Who giveth this woman to be married to this man? > *Then shall they give their troth to each other in this manner. The Minister, receiving the Woman at her father's or friend's hands, shall > cause the Man with his right hand to take the Woman by her right hand, > and to say after him as followeth.*