Surprisingly, the sluttiest most sex positive uninhibited "I wanna make porn" run around nekkid polyamorous bisexual women I've met have really been disgusted by feet. Go figure. (And I mean 'sluttiest' in the most respectful, empowering, en solidaridad kinda way)
As for 3. -- try wearing flip flops in NYC in the summer. Same thing. My feet developed a hard crust not unlike some baked bread and my soles turned ink black. I got a $15 pedicure and I think I shocked all the patrons and workers there. My feet remained crusted and discolored, but they were able to shave off a couple inches of hardened skin, god bless 'em.
Feet only turn like this when they are in cities I think. And the 'fat ankles, broad feet' thing can be true for people who live shoeless and especially in the cold. Louis Leakey tried to take molds of feet from this certain group of people near the Andes or someplace cold like there where crossing cold rivers was common.
BTW, it's good to see you being compassionate of your shoe-free brethren.