Just thinking out loud...
The pro women today seem to play much better as a whole than the pro women of the 90's. When you watch those old matches, a lot of those women tried to have perfect pinned elbow pendulum strokes. I think its because the women at that time had coaches preaching the pendulum stroke, whereas most of the men were too proud, and developed naturally.
The women of today have much more piston strokes, like the men do.
Maybe that is one contributing factor to their improved play.
I remember watching Pam Treadway come up in the late 90's/early 2000's in the Philly area. Her stroke was "like a man's" and she dominated for about 10 years every regional event she entered. The other women had a dink stroke with a locked elbow.