I think that Protestants do not accept Mary as the Ark of the New Covenant, nor do they understand that all the doctrines regarding Mary are a direct understanding and defense of who Jesus is, not who Mary is.
Many, much like an earlier poster here, seem to resent that Mary is elevated in any way, or that she is more blessed than anyone else.
God chose her, over all others, and prepared her to be the Mother of the Lord God, Jesus.
No one resents Mary. The account of her in the Bible is awe inspiring to me. Could you imagine knowing that you were responsible for raising the Son of God? It gives me chills and makes me cry to just think about it. She is more blessed than me to be sure!!! However, I don’t need to believe things about her that the Bible never states and in places contradicts. I don’t need to raise her to the status of sinlessness to understand that she was special in God’s redemptive plan for mankind.