Ohr Chodesh: The Drishah is recent? I guess the Sma hasn’t been on the side of Choshen Mishpat for over 500 years now. I don’t recall where, but I believe the Bach somewhere quotes a story about one of the Rishonim and a woman who learned. But I guess the Bach is a “very recent innovation” too.
And it’s two De’os in Tosfos if a woman can be a Dayan, I believe.