Earlier quoted context omitted.
What if you do that and the number of women in the orchestra shrinks?
Or even if the number of women just stays the same. Is the effort to level the playing field then deemed a 'failure' if the results don't change in the way they're expected to? That's the important question here, especially since there have now been preliminary experiments in tech interviews suggesting such an outcome is not implausible: http://blog.interviewing.io/we-built-voice-modulation-to-mas...
The point is to remove as many obstacles as possible. We want the best to get the jobs, but if the are barriers based on gender or race or religion that's potentially denying us a brilliant woman, or black man, or Muslim.
It doesn't necessarily mean you end up at 50/50, I'm quite willing to accept that the sexes might be biologically different in brain structure and that this might mean one sex might have different average aptitudes, but I won't accept a societal construct on top of that.
You should never hear that someone shouldn't try to do something because of their sex. Never.
Well unless it involves the more obvious anatomical differences. The average man is going to have some difficulty becoming an effective wet nurse.