This discussion has happened before.
The "few differences" people are talking about – torso length, shoulder strap width, position and curve (or not), hip belt width, postion and angle, sternaum strap location, etc are all the things that tend to be different for most women who have trouble fitting a man's pack.
Not hype, just anatomy. Female skeletons in general have a wider pelvis, narrower shoulders and chest and shorter torsos. There are always exceptions, like less curvey woemn with broader shoulders doing better with a guy's pack, or slighter-framed men doing better with a women's pack, but given the generall population, there is a need for a "women's specific pack."
I for one need those fit differences constructed in a pack. When issues like this come up, I can;t help but wonder how the men who think women don't rate or shouldn't have gear constructed to fit them would feel if the "standard" packs were constructed to based on female anaotmy and these men were told, "just live with it," or "make it work," and "stop whining" because manufacuteres shouldn't "pander" to male consumers. "it's just hype, after all."