I think the argument is quantity vs quality here. In past, we had no expectation of privacy in public places, so you might be seen or even photographed, but rea

I think the argument is quantity vs quality here. In past, we had no expectation of privacy in public places, so you might be seen or even photographed, but realistically that happened rarely. But if facial recognition could capture your whereabouts at all times in public, that's a significant change in the level of observation and tracking, especially if that data then belongs exclusively to someone else.