Different cultures and different religious traditions have different norms, that’s the main thing. Giant religions, especially relatively decentralized ones are not a monolith.

In the Gulf states the all-black style is more common for locals, Saudi is massive so it’s different in some areas, here in Lebanon you have many sects and the all-black is more associated with fundamentalist Shia Islam, and so on. Most women who wear headscarves are wearing colorful ones.

As a little kid when we still had a bit more tourists coming from Kuwait and the UAE, I would see some women in Niqabs (full face cover) and metal face plates, which would freak me out. Those are not a thing here.

I think most Americans think all of these are one blob, and use “burka” as a catch-all. And that one is only a thing in super fundamentalist societies in places like Afghanistan, not something common at all. It would be like me assuming all Americans live like the FLDS.