“What exactly in today’s reality dictates that women should be learning? What has changed since the original BY that would obligate girls to learn?”
There are two seperate issues. 1)Is there a reason why women specifically nowadays NEED to learn 2)Do the reasons why in the past women were not supposed to learn still apply nowadays.
I was discussing the second issue. (I am more than willing to discuss the first issue as well, in a minute.)
“but on the other hand, there is no reason why they should.”
The reason why they should is to know the halachos.