In IT, in 2008 women held 25% of all professional IT jobs in the US: https://www.forbes.com/sites/lorikozlowski/2012/03/22/women-...
An order of magnitude difference.
I have never seen discussions about gender-based discrimination for plumbers, or biological or sociological factors preventing women to seek career in plumbing. My personal opinion, on average, women just don’t want to do plumbing. And the society seems to be OK with that.
I wonder what’s so special with the software development that causes companies to do positive discrimination, gender-based hiring targets, and other stuff these companies apparently do in the US?