I will admit to only having skim-read the thread but just wanted to add my own experiences of women wearing hijabs (and my own).
Some time ago I travelled in Iran which meant I had to wear a hijab in public - I didn't mind, after all it was only for a short period of time after which I could return to my normal freedoms, and it was entirely my choice to travel to a country where this was mandatory. It was usual to be able remove it when in female-only company/in private (e.g. a private home). I just thought I'd add that as there was reference above as to whether they were worn all all the time.
I did learn quite a bit of Iranian history while I was there, including the run-up to and period of the Islamic Revolution. In the decades before the revolution, Reza Shah wanted Iran to be more western and tried to enforce western-style dress. As part of this the hijab and chador (a wrap you hold from the inside) were banned. Our guide talked about women who didn't go outside their home for all the years the ban was in place, often because they didn't want to for religious reasons (although I'm sure there were some who were stopped by their families). Women who refused to unveil were beaten.
(And that sort of sentiment was not uncommon here in the UK until relatively recently - my old next door neighbour was born in the Edwardian era and just would never ever have gone out without a hat or headscarf, it was just unthinkable to her.)
There's an argument that the move against "traditional" beliefs in Iran which was - and remains - a very religious country, contributed to the rise of the Ayatollahs who promised religious freedom and...well, we know how that ended.
The tl;dr version of all that is bans are a bad idea, it takes away freedoms and hands potential political leverage to those that would misuse it. So I don't want to see a ban, women should be able to wear what they like including by covering their faces if that is their own personal choice in their religious belief. That choice should be completely free and I absolutely accept that, directly or indirectly, it often isn't. But I still don't want to see a ban because those women who don't have freedom of choice will probably be forced out of society completely, as the Iranian ban showed.