How is the topic of "well people are okay with this totally separate usage" such an issue? Obviously how an image is used matters. If you take a photo with a camera that automatically deletes it immediately, nobody cares. It's not the act of taking a photo that people care about, it's what you do with the picture afterwards. That's why consent is great. One person might think the photo of them in a bathing suit that…
If people are jumping in front of me paparazzi-style, pushing, gaping, pointing, flashing their cameras, I'd be bothered whether the camera deletes the image or not. I wouldn't even know whether it does. For me the act of photo taking, the unexpected attention in a public space is a bigger deal than the picture. Luckily, I'm not interesting enough