I'll relate to personal experience again.
My line manager, senior manager, and director level are all female, and they are all competent.
I went for a job a while ago - the line managers job - for which I have the experience, knowledge, and skill set to do, in fact I'd done it for a year acting, mostly well, but I didn't get it.
I remember being furious at the time, to put it mildly I thought I'd been 'humped', I should have got it right, I was the incumbent doing the job well, being mostly competent
It took me a while, and a lot of resentment later to realise why I never got that job. I simply hadn't put the time in, and it was as simple as that. As I stated, unless there was a crisis, come 5pm I was gone. I never made any sacrifice, and looking back on it I'm completely fine that I didn't put the work in. How many days/months with the boy would I have lost, and be continue'ing to be losing now had I got that job? Subconsciously I'd already made my choice.
A contrasting example when I was younger, and changing career. I was hungry and wanted to progress, and so I did the 10 hour days every day, and then working at home til 10pm. I did well, was competitive, and didn't care what anyone else was doing. If I did 10 hours I could do more than them.
The truth is, when people put in that sacrifice they succeed regardless of circumstance. Few people (of either gender) are willing to fully commit - as I didn't for that last job, and that is why they don't make it to promoted positions.
Now regarding circumstance, I come from what was regarded one of the poorest areas in Livingston and never went to University. By any measure of circumstance I shouldn't be where I am. To societal inequalities I say, sure they exist, and I know my fair share of drug addicts, even dabbled myself for a while in my 20s. But if you say f*ck that, nobody owes me anything, and start crawling, you will succeed.
I'm going to slip away for a while now, I'll continue to lurk. Though sometimes I can't help myself when the lefties start with all their oppression nonsense. ;)