Ames, arguing is EXACTLY how Torah shebaal peh is meant to be done. Enough “vahev basufah”. Back to the arguing!
I hunted down tonight a shearim metzuyanim behalacha, one of the best sefarim for bekiyus and “reid” on a topic. It was one of my best friends while learning chullin for semicha in my pre-balabos days.
He quotes a Shu”t Maharshal siman 29 that his grandmother used to teach big rabbanim and gedolim from behind a curtain for many years. I don’t think we’re arguing about this, but good to know nevertheless
In Sefer Chassidim 313, he defines tiflus as “omek talmud”, “taamei mitzvos”, and “sodei torah”. This does shtim with the Taz. It looks like from the likutei halachos that only one level was permitted, ie the lower level of torah shebiksav. Torah shebaal peh was not permitted except for mussar. Based on everything, the following would be assur even today to teach women unless we mattir even torah shebaal peh based on “eis laasos”:
1. Mishnayos and Gemara (Sefer Chassidim, Reb Moshe ZT”L);
2. Ramban on Chumash (Taz, sefer Chassidim);
3. Maharal, since “sodei torah” ( sefer Chassidim)
Seminaries avoid #1 like the plague. #2 and #3 are widespread among all seminaries, despite the fact that they’re torah shebaal peh. Clearly they have a heter, since they get the daughters of the best rabbonim. So clearly they have a heter for Torah Shebaal Peh.