It is very likely to be unnecessary and the source of such ideas most probably comes from the wrong place. Consequently, no legitimate [contemporary] Rav would mandate the wearing of a burqa.
Nevertheless, is the outrage against them justified?
From personal experience – when I walk past these people in Meah Shearim, it really annoys me. I see them and I have what can only be honestly described as a שנאה. It bothers me, because I don’t know where it comes from. From a rational perspective, they are not doing anything wrong, they are just fools [and well meaning fools at that]. And I don’t usually feel hatred towards fools.