https://www.scb.se/contentassets/e2d35a542c554e308ae8a11909c...
Politicians doesn't change overnight as barriers are removed. A man who entered the field in his 20's 1975 got retired just about now, that is how long it takes for change to fully propagate throughout society. So if 1975 was the year that it got equally acceptable for men and women to enter the field now is about the time you'd expect men and women to have equal seats in politics.
And that graph lacks the last election result, Sweden currently has 47% female parliament members, so about even by now.
Edit: Looks like USA is about where Sweden was 35 years ago on this. Reminds me how different cultures can be, and why the American gender discussions are so different from what I'm used to. So I guess USA might see a gender equal parliament in about 35-40 years.
If women aren't part of parliaments, we can't expect women's rights to advance significantly and all people (including men) would greatly benefit from this (better collaboration, more peaceful society).
I guess Western societies are quite decent defending and increasing the rights of underrepresented people, given that in the past century (or so), women got the vote, non-Westerners got citizenship (and therefore voting) rights, ...
And if your answer is "it's impossible", then you can care that Iceland is a counterexample.
The whole point is that it doesn't.
Humans aren't rational machines; they're sexist, racist, bigoted etc.
This result may indicate a betterment on some of these fronts.
It is news, because it is outlier. Generally, parliaments these days have some women in them, but not nearly half. Except countries where there are no women in parliaments.
This event is meaningful to women.
If you don't possess the capacity for the empathy necessary to intuit why this is meaningful, then I don't think someone explaining it to you will make a difference.