“PAA, what’s wrong with the halacha as it is and has always been that there is this itch to change it?”
That is the other issue which until now I was not addressing. But now I will discuss it briefly. I would suggest that there are several problems with the current system of girls learning (primarily speaking about halacha/hashkafa as opposed to Tanach).
1)Girls are not taught to understand; they are taught to memorize a list of rules which (to them) doesn’t really mean anything and often probably seems to not be sensible.If they would learn Gemara with the Rishonim/Acharonim/Poskim they would be understanding instead of memorizing. They would see how the process works – e.g. they would see how a halacha is based off a memra in the Gemara which provides a scriptural source and then the Rishonim debate the pshat in the Gemara and then the Acharonim conclude as to which we Rishonim we should be choshesh for and which Rishonim we shouldn’t be choshesh for. This brings an entire new world to light for girls. (This same problem might exist for boys also, depending on how they learn/are taught.
2)Without learning Gemara you are really lacking the basics and fundamentals of understanding Judaism. This point is a little hard to express but I think Bais Yaakov Maidel said something similar in the (in)famous thread a while back.
3)Without having any background/knowledge in Gemara, a girl is at the mercy of any one who quotes her anything. If a girl hears someone quoting a Gemara, she has no way to know if the quote is real, if it is being taken out of context, if it is being misunderstood, or if it is being abused to further someone’s agenda. I see this all the time.
I realize that some of these points sort of overlap. Also this is just a brief touch on something which is rather hard to explain but I tried.