I get the frustration, and I know you didn't say it was unusable, but other posters have, and that's what I was providing information to counter.
The "Pro" name is just that, a model identifier like the MacBook Pro or Mac Pro - it denotes a level of features, not that the features are necessarily suitable for say professional photographers.
Regardless, you are correct, it is the same lens used across the iPhone 11 family.
Personally, I hope Apple does not try to correct for flare in software, as such approaches inevitably get it wrong and we will end up with areas of darkened or blurred photo when the processor misinterprets areas as flare.
Even the flare correction in Photoshop is far from perfect and often causes more damage than it repairs.