I’m also a trained photographer. Been shooting professionally for 18 years, 10 years as an amateur before that. You can’t control lights in spontaneous situations. The only place where you have real control over light is in a studio.
There’s a real issue with reflections on the front glass of the iPhone since I believe the iPhone 6. It became a serious problem with the iPhone X. This is caused by a gap between the front glass and the lens. A lens alone would cause lens flare which is normal. Reflections on the other hand ruin photos. Nighttime video in a city with cars and other bright lights can become unusable pretty quickly.
Here’s a good demonstration that I found:
This is of course a forced example to make the problem clear but it does pop up regularly in non staged situations.
Here’s a real world demonstration. The lights on the dock reflect in the sky like a runway.
This is not
normal lens behaviour. It’s a design defect that Apple has ignored because a front glass cover is the most efficient way to build water protection for the phone. To prevent this, they’d have to build the lens elements into the case itself. You’d have a curved lens on the outside, not a flat cover glass. Reflections would not occur. Presumably, this would be more expensive to build at scale since the case and the camera components come from different manufactures.
I wonder if a lens coating would fix this. That’s why I ask if the Xs had solved it.
EDIT: there’s a whole MacRumors thread on this:
https://forums.macrumors.com/threads/huge-defect-with-the-camera-extreme-lens-flare.2085341/
As expected, many people don’t understand the difference between lens flare which is normal and reflections which are not.