Well here's a few possibilities.
Women weren't interested enough to practice hard enough to get that good at chucking arrers.
Or those who were interested were put off by the overall blokey atmos, disparaging comments from others, or very possibly genuinely not having enough time, confidence, or resources to practice more.
As a woman (yes I know crazy stuff huh

) I've often had folks suggest - either explicitly or otherwise - that what I'm putting my time and energy into, isn't quite appropriate for my gender.
But being an awkward cuss, I ignored them, and got on with it, however the undercurrent of
"This stuff isn't for you" was still very much there.
I still hear the same from younger women entering occupations / leisure activities, which are non trad female.
You still get dumb@rses on the internet suggesting stuff like 'go make me a sandwich' - threatened or what??
And the images, and advertising still reflect many biases.
It's wearying having to resist all that invisible tide of negativity - esp when it's combined with our own self doubts when starting out - which are common enough to all humans of course.
The more females seen doing all these things, the more that becomes perfectly normal, unremarkable even.