I'm a bloke and it's none of my business to opine on what women do with their hair. You won't get my view on what "women should do". I may however give my thoughts on this thread in general if that is ok.
I think the OP has a point....
....but it's been completely lost in the "men" argument she led off with. It's a facile argument that has ended up largely destroying anything interesting that could have been discussed.
It's clear that practical considerations and budget tend to guide other women's beauty standards - it's not about being submissively beautiful to men. Being able to tie one's hair up quickly, not have to pay for a haircut every six weeks - these are the indicators as to why hair is long. The men argument derailed any interesting analysis on that.
I have reliably read that over 50% of women in the UK are found to be either overweight or obese. It is therefore highly unlikely that with such face shapes, people are going to go for a pixie haircut or bob that won't frame the face as well. I think this is the reality of it all, rather than the "it doesn't suit me as well as long hair". I think for these body types, long hair draws the eye away and provides an anchor point for a sense of style and self. And fair enough, makes sense.
If you're a Charlize Theron in build and bone structure, with a big budget and plenty of confidence, then she will do what the fuck she wants - of course short hair absolutely rocks on her.