According to Mark Gurman, the iPhone 16 Pro will have a new button for the camera. This is very interesting:

Speaking of buttons, there will be a new camera control on the right side of the phone (at least on the new Pros). It will operate like a button on a DSLR camera, allowing you to press in slightly to trigger autofocus. A harder press will take the picture. You can also swipe along the button to zoom in and out while shooting photos and videos.

Because I don’t have an iPad anymore, thinking about getting the Pro Max next time. Will need to hold it.