Ubi, men and women do not have equal mental capabilities.
There are significant differences in the structure and function of male and female brains.
There are differences in processing in the hemispheres of the brain, in processing from the two sides together, in the effect of hormones on brain function, in the size of certain areas of the brain, in the likelihood they’ll suffer from certain brain disorders & etc.
I’m not knowledgeable enough in the biology and chemistry behind this to understand and explain it all, but I can definitely say that men and women process information differently.
It seems obvious from the fact that Torah and Halacha do not regard both genders identically, that the differences between them are profound.
It’s the old theory of ‘birds who need to fly were created with wings and feathers; fish who live in the sea with gills and fins…’
We were each given the brains that will help us carry out our Tafkid.