“Big deal— Abraham, Jacob, David, Solomon, and others all had multiple wives....”
Yes, and in each case these plural “wives” brought them grief and harmed the Kingdom of Israel and the world. Also, by the time the Lord Jesus was on earth, plural marriage was no longer recognized. It actually was never “sanctioned” by God at all....more or less tolerated at best.
Ditto.
Are you saying God doesn’t sanction what he doesn’t prohibit...?