More specifically what is femininity today? Are most men attracted to it or is it just a loud minority? Is it rare in the developed world?

Not in the physical, hormone or chromosome sense. Someone asked what masculinity is and the other day someone asked the appeal of submission.

Do career climbing, age, heartbreak and n count diminish femininity?

Can a woman be feminine but also self actualised? Especially if she doesn't want kids, what about after the kids have grown up?

If being feminine is about being comfortable with a man leading how does that work in an egalitarian society when she is probably more likely to be competent at leading and has more self belief?