“The halachos are the same now as they were then, nothing changed there. We are learning the pertinent halachos the same way it was learnt back then, baal peh (or for some topics, using a kitzur). Why the need for change just because the times changed?”
I am deliberately trying to keep the two issues seperate. I think you are combining them. Let’s grant that the starting point is that everyone should learn the parts of Torah that are relevant to them, in the best possible way. However, there might be overriding factors. So let’s say that Chazal thought that there were overriding factors that should prevent women from learning. Would it be a fair assumption that if those factors went away then we would be back to the starting point of women learning? This is all independent of whether there are issues nowadays which should COMPEL women to learn.