That's because most ancient societies were blatantly misogynistic.
Actually, my understanding is that the emerging reality is more interesting.
Pre-agricultural hunter-gatherer societies were non-patriarchal and patriarchal societies only later became the norm with the rise of warlike/raiding and settled agricultural societies which co-evolved and co-depended on higher population densities.
This is certainly the case here in Zomia where uninterrupted matriarchal societies have continued to exist until today, though they are now rapidly disappearing.
However, writing did tend to evolve only after this shift, so your statement may tend toward observational truth despite being based upon fallacious assumption.