It's not about the visibility, it's the psychological impact it has, having a camera pointed directly at my face 100% of the time is very different than sitting in a room, reading others' faces, attention (where are they focusing their gaze? When are they drifting off? When are they tapping their fingers on the table?).
I don't know why I hear this argument so many times, a camera on my face is a very different experience than sharing a room with others, I don't see the parallel.