I imagine it's because there is a huge shortage of women in tech and while tech companies are frequently pressured to increase diversity which means drawing from a pool that represents less than 20% of developers.
So the real issue here then is that there simply aren't enough female developers, a huge demographic that can be tapped for the overall shortage of developers today. Either not enough women are going into tech or too many are dropping out before making it to a career and it is VERY useful to analyse why this is. Rather than asking "why aren't you hiring women?" we should be asking "why aren't there enough women?".
Don't put your soap box up in the way of productive lines of inquiry.
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