Someone asked me this a few years ago, “if the camera on you iPhone is so much better than your Mac why not use that as your webcam”. Well there are apps that can do that. Some need to be connected using a cable. And for some you need to pay for it, perhaps it is to get more features or remove their logos.
Now with iOS 16 and macOS Ventura your iPhone will connect automatically so you can use it in many applications such as Zoom, Teams, Skype, Camtasia and many more that would normally use your built-in camera.
The iPhone camera is not just better but it is better in low light. Maybe the cameras they start putting into the Macs will get better.
The other thing is it also uses Center Stage, it’s like having a camera person follow you as it pans around to keep you in the frame.
Something else that is useful is you can move the iPhone to show something. Of course if you are just using it as a webcam to talk to people or record something you will most like it mounted on a stand or tripod. There are mounts available to mount to your laptop.
Here in this video I show you how it works.