Exactly. The reality is that women were not really trying them it’s not like Yu Na was landing quads as a junior and somehow stopped Miki landed her quad like once. Since no one was doing them it wasn’t with the risk.I'm sure we'll see more women doing quads and 3As as the next generation comes up.
Women have always lagged behind the men in terms of difficulty, but they do get there.
And as more girls/young ladies show interest in learning those jumps, training techniques will evolve that are suited to them.
But now enough are doing it more will train it. Typically girls learn their jumps prior to puberty from what I have seen and then keep them.
So it’s not surprising that 18 year women were not able to immediately get this jump.