Yes it does have to. Claims of descent from Abraham does not mean adhering to the same ideology that was developing from Abraham. The descendants of Esau (Abraham’s firstborn grandson from Isaac) certainly did not; nor did the descendants of Ishmael, who most Arabs claim descent from.
That’s your opinion. Several billion Muslims already consider the matter settled. And it’s bizarre that you find arguing about the Koran not describing something already covered by the OT more important than any holy book of morals outlining clearly and specifically that raping a child, a young, unbetrothed girl, a slave, your wife, or a widow utterly unworthy of mention. But it says a great deal about you.