Health, I don’t think that’s true about Mishna and Gemara. There is a Chiyuv to learn Halacha, but other than that, the reasoning and Pilpul of how the Halacha came about, is not included.
Sam2, I don’t find the learning on their own to be such a Chiddush. The Gemara Mentions teaching your daughter, which souds like unsolicited teaching. Bruria had to have learned it somehow. If I remember correctly, the Drisha’s mother was a Melumedes.
The only thing is Shitas Rebbi Eliezer, that he didn’t even want to answer a woman in learning. Perhaps she was not a Melumedes on her own, and he was worried about Hizharu Bedivreichem. What went on in Beis Medrash was kept a secret from anyone.