As a photographer I’m a firm believer in the right to take photos and videos in public, for both artistic and documentary purposes.

sure, no problem with that, just be careful.

There is no expectation of privacy when in a public place

that's blatantly false. However much you deny it, there is an expectation of privacy in public. we are not going out to have a chance to be acting on your photos and videos. we are going out because we need to, to go to work, the shop or to the doctors.

it would be right to say, there is no expectation of being invisible, or that nobody will see me do my things on the street. and of course if we do something silly, people will see that and judge us. but that is not what you said. there is an expectation of not having a permanent record of our own lives if we don't want, and anything standing in the way of that needs to go.

that being said, yes, you can take photos and videos in public. granted that there are no unconsenting people in the scene, or that they will not be recognizable in the resulting images. otherwise dont be surprised if you are being judged.
recognizability does not only mean, whether do I know that person, or whether the face is visible. photographers are notorious for uploading their images to tech companies that have the capabilities and the practice to do their magic on photos to recognize people by their other attributes.