Two problems I have with the family proclamation

Despite the fact that The Family: A Proclamation to the World has never been canonized, many members of the Church of Jesus Christ of Latter-day Saints treat it like scripture.

Whether it is scripture is a topic for another day. What I want to discuss is a couple of things I find problematic in the proclamation.

My understanding, based on the rhetoric of mainstream Mormons is that this proclamation is a response to efforts to legalize marriage equality. If that premise is true, I don’t think that those who drafted the document completely thought through how the wording would affect Mormon past.

Consider this from the first sentence:

. . . marriage between a man and a woman is ordained of God . . .

Does that mean marriage between a man and more than one woman is not ordained of God? What about marriage between more than one man and one woman?

Does that mean plural marriage is unordained of God? Does it mean the current practice of sealing a man to more than wife is unordained of God?

What about this sentence from the seventh paragraph?

Marriage between man and woman is essential to His eternal plan.

Does that mean plural marriage is not essential to God’s plan?

If plural marriage is not ordained of God and is not essential to his plan, why did as a church practice it at all?

If plural marriage is ordained of God and is essential to his plan, then how does it fit into the wording of this proclamation?