Burkhas are hot and awkward and inhibit full range of vision, and thus can present a safety hazard. Of course, if you are trying to impersonate someone or film on the sly, they might be useful. But I simply don't believe that working women, doing farm labor or cooking, or in theory trying to walk somewhere or get on a truck to deliver goods to market, wouldn't prefer pants, tunic, and headscarf draped to allow peripheral vision. Women don't wear them at home out of sight of the public. If the burkha is so great and comfortable, why aren't working men wearing them? After all, men wear kilts, the equivalent of shorter skirts.