Hard wired biology. Once a male has emptied his nads it doesn't really matter if he dies, but obviously he has some use afterwards punching mammoths and shit. Women had a brood to keep alive so naturally you're going to take safer options and leave the whacked out stuff to someone more disposable.
3-4 generations does not wipe that difference out even if it's expressed in vastly more subtle terms these days.
The figures for men vs women in much more conventional areas of investment reflect that too. I can't think of many women with active porfolios compared to men.
I wonder how long that will take or if it ever will change... It's probably been 20000 years at least since external threats have been a danger and a burden for only one gender (I think modern agriculture is around that time and, if not, that's what I'd put as the benchmark for when we no longer needed gender specific roles for survival).
But there is also a chance it might never be completely fixable for a long time in that case or at all...
I was looking at the top 100 companies in the UK and 5 have a female ceo and I don't think that's an irrelevant statistic either there is likely a gap im missing as well as the patriarchy (which for older companies is likely a problem).