I dated a model for a few years when I was much younger. She was on the cover of magazines and the like. In her photo shoots she always wore a wigs.
One magazine was a Black hair care magazine she was in the cover wearing a wig. I found this to be misleading, because the article covered hair care not wig wearing.
I write all this to explain @Chevdove that I do not believe all women in the photos you posted are sporting their own natural hair. As a result, it is difficult to get into a discussion of this type if you don't believe the source information...
But I get why women love to talk about this stuff. I presented at a Bloggers conference one. It was 90% women. Interestingly most wore their hair in what appeared to me to be natural styles, and many were quite attractive. To my disappointment about 1/3 of the Bloggers wrote about hair. There was this really popular Blogger they were all seemingly attempting to emulate, because they kept bringing her name up (I wish I could remember her name). At any rate, the whole event was boring to me -- thought the women seemed to enjoy themselves.
I can't understand women's fixation with hair. I'm not passing judgment. I'm just making an observation. I don't get people obsession with baseball either. In every relationship I've been in my partner invested a lot of time, energy, money, and emotions over there hair.
And boy, whenever I was asked how I thought their hair looked the answer must be "It looks great honey!" and I better say it, with feeling, like I mean it too :-)