If you look at the disproportionate number of older women in poverty, you can see how undesirable it is to actively encourage women not to be financially self-sufficient.
At the moment, some of that is that, as usual, things that were set up to give advantage to men, have now been changed to be 'fair' because those reasons are forgotten, and, once again, it's women who suffer.
The trouble, as Japan is seeing, and the UK is on the cusp of, is that society needs women to have children. The tax and NI we pay isn't for our pensions, it's for the people who are receiving pension now (a simplification, but broadly speaking true - the money is used now, not held in savings). Our pensions will be paid for by our children.
And much as women as a class haven't caught up with the idea that they need to be better at risk assessment and mitigation by remaining employable and not trusting the fairytale, Society hasn't caught up with the idea that if you don't incentivise women to have children (or bully them as in the past), they will eventually significantly reduce the number of children they have.
Eventually women will notice that having children screws them over, but not the men, and men will start actually having to work to persuade women to have them - that or society will turn right back around and start forcing us. The pessimist in me is expecting everything to start swaying a little too much towards the stick rather than the carrot.