Hi there,
I don’t think this is a real issue. From the moment I noticed the flares on my iPhone 11, I started to notice them in all the pictures and videos taken by the people around me with other iPhones/phones. There’s one trend that I noticed: newer iPhone/phone models have more apparent flares. If you simply take an iPhone 6 or a mid range android phone, you will notice that it barely has any flare because it can barely capture anything from a bright source that it faces. I could only bring the flares out when I manually customised the lightings and found the perfect angle where the camera could actually handle the light properly.
All I’m saying here is that these flares appear because the iPhone 11 has a more sensitive/capable sensor. Perhaps it’s also over exaggerated compared to other flagships since the camera holes are larger and maybe apple’s AI system treats it as a detail and tries to sharpen it. It’s important to point out that other flagships still have it but less exaggerated as you can see in the first posts in here: https://www.geekzone.co.nz/forums.asp?forumid=76&topicid=257319
The theory of a defective coating might sound reasonable but I’ve seen too many examples of flares close to what I’m seeing on relativity new iPhone models such as iPhone XR, 8, and 7 that I can’t simply ignore and assume that it’s a defect.
Take a look at this apple article which points out to flares and other light artifacts.
https://support.apple.com/en-kw/HT203692
Also look how this iPhone 11 camera review has flares in some of the examples but it never gets pointed out as an issue. Take a look at 7:04, 7:45, and 7:11
https://youtu.be/k4bs5rdZy6k
For those who reported a flare-free experience after some kind of repair, it’s quite strange that most of them didn’t provide evidence, or if they did, the before & after comparison wasn’t very consistent or it only included examples of very minor flares. I will only believe if someone reproduces one of the intense flare-examples that they had ( the ones with clear green reflections ) but with dramatic improvement (in term of flare) after the repair without any photoshop tricks.
I recommend you guys to take a look at this reddit post if you feel like it:
https://www.reddit.com/r/apple/comments/da6qft/iphone_11_pros_irritating_lens_flare_problem/?utm_source=amp&utm_medium=&utm_content=comments_view_all
My last words for you guys: Ease-off your minds and enjoy most of the beautiful pictures that you will actually take in normal daylight instead of weird lighting scenarios!