Not really. From the start, it was not God’s plan, sin and man’s lustful pride to dominate over women is what led to it, and while it did exist, wherever it did exist had terrible consequences within the Family and more importantly, among the People of Israel [Think of Samuel]. So while Polygamy existed during the periods accounted for during the OT, again it was not part of God’s plan as Christ himself revealed, Christ the Groom, and one Bride, the Church.
I completely agree with you. I only said it was Biblical. There are a lot of marriage forms (and government forms, and judicial forms, and legal forms, and social forms) exhibited in the OT by our fathers in the Faith which are not moral norms for us. But they are Biblical.