Your comment amused me a bit, so I wanted to write something in response. I work in metal fabrication, our workshop specialises in structural steel, so we are part of the general construction industry. We call ourselves 'boilermakers', though I've never worked on a boiler.

Anyway, in the 17 years I've been doing this on and off, I have met precisely 1 female boilermaker. And nobody cares.

What I don't follow is why is gender imbalance in other industries seen as a problem but we never see any serious attempt to get more women in to the construction industry.

Why does anyone care there are differences in numbers of men and women in various industries? Things change over time, fashions change. I think approaching these issues from the "we must correct this imbalance" is incorrect reasoning.

And, lastly, if we do manage to level the playing field, what will gender identity become?

A quote form the film Trainspotting: One thousand years from now, there will be no guys and no girls, just wankers.

I'm willing to posit that strong gender roll identity is crucial for a healthy and resilient culture.