Thankfully, the law isn't as overly simplistic and black and white as that. It'd be very stupid if it were. We have the ability maintain a general principal like "there's no expectation to privacy in public" and still prohibit certain things that are deemed harmful, like taking upskirt photos of people while they are in public spaces.
If you're going to argue platitudes from altitude, you don't get to retreat to the comfort of circumscribed exceptions.
Nobody is talking about cops or flock cameras taking upskirt photos.
Just as we have the ability to pass laws prohibiting that specific harmful use of cameras while in public spaces, we have the ability to do something about the harmful uses of police and flock cameras while in public. The conversation is about the harms of mass surveillance and the exceptions necessary to protect the American public.
Hello, I'm here.
Practically, we do have privacy in public pre-AI. We weren't entitled to complete anonymity, but the ability to track every single person at all times was impossible.
Now that AI and sensors are making it possible, people are saying "No, I don't want that to be the norm".