The iPhone 16 Camera Control Button will make your photos worse.
To put it simply, pressing the physical camera control button versus tapping the shutter button on-screen makes it more likely that you will end up with a blurry photo.
Oh, the irony!
Especially if you one-hand your phone to take photos, you will definitely get blurrier photos since the force you put on the button will make your phone shake.
Apple was touting that they will update the button later this year with the ability to half-press the button to focus and a full press to take the photo.
This is even worse because your camera already does a really good job of focusing on your subject. If you really need to fine-tune your focus point, the touch screen is the only way to select a focal point accurately and quickly.
I do love the button for quickly launching the app, but that's it. It will come in handy in emergency situations where you really need to grab a photo or video. For that, it is invaluable since the button works every time. You can essentially start taking photos and videos even if you are blindfolded.
There is one limitation with video recording. After launching the camera, you have to press and hold the button for video recordings. When you let go of the button, the recording stops. A simple update should fix that to allow the recording to continue after letting go of the button.