Not entirely sure what your point is tbh?
First off, the hijab and burka are different, if related, things. The hijab is just the headdress; not a million miles off a granny shawl. They can actually be very fashionable, although I don't agree with its rigid compulsoriness in certain places (
this is an example), especially for visiting foreigners, but hey, if you are visiting, you know what the rules are in advance, and you always have the choice not to visit.
The burka is the full cover - face, hands, the lot. It incorporates a hijab, but goes a lot further.
You are right that there are differing standards of dress modesty in various cultures - but I don't think your comparison of genital covering is really appropriate. The main reason I'd give is that genital covering is applied to both sexes, whereas the burqa is openly misogynistic. There is no comparative requirement for men. And that ties in with the more openly misogynistic parts of the Quran quoted earlier. (Genitals are also associated with more intimate, personal, acts, and also with disease - whereas showing face and making eye contact is actually a factor in building basic trust, and covering your face naturally gets in the way of this trust).