Lior and DaasYochid:
There was a very big change from the times of Chazal. Ayin Likutei Halachos on the Gemara in Sotah. This is just taking that idea a step further. (Granted R’ Yoel in very strong terms made a chiluk between certain types of learning e.g. Gemara, where there was mamesh an Issur)
Because part of point 1 and 2 is that (specifically) a contemporary girl’s exposure to other Chachmos will likely cause her to perceive the Torah as lacking in many areas, simply because they don’t have any real hasaga of what Torah is.