One thing is that it took a long, long time for women to break into medicine and start being taken seriously as doctors. Tech is still relatively young, so I'm hoping that we can start making movements towards that level of parity faster than then several generations it took medicine.
Sure, if you count from the beginning of the medical profession (though technically, women dominated some parts of medicine, like delivering babies, for millennia before men ever became involved, and then women broke back in).
If you count from the beginning of women-in-the-workplace style feminism, software should have had women almost from the outset. If a new profession or a new sector of the economy arose now you'd expect it to have tons of women because as a culture we're used to women in the workplace, right? What about biotech--are there more women in biotech than software?
