they don't steal desk space. they let you use the same screen for other things. they're cheaper.
BUT MORE IMPORTANTLY
I've tried them with my team at a past co and people were FREAKED THE EFF OUT by the idea. They DO NOT WANT. It doesn't matter that it's logically the same thing as being in an open office. they DO NOT WANT a camera pointing at them, even knowing that it's not recording.
some people are ok with this, most aren't.
this appeals to "leaders" who don't trust that their people are working if they can't see them at their desk.
DO NOT USE THIS. Society is _NOT_ ready for cameras pointed at them while they work and folks feel it's a SERIOUS invasion of privacy.