The 11 pro does have more ghosting and dot issues than current flagship phones, but with that said, you cannot defy physics, even high-end DSLR and Mirror-less cameras struggle with flaring, but professionals understand flaring enough to avoid it, whether with studio lighting, or just basic camera adjustments, they manage to make stunning shots, and you can see that with several commercials filmed with the 11 Pro.
Phone manufactures are able to accomplish the quality they produce because of the software and AI they use, where as a dedicated Camera relies 100% on the hardware they have. The lenses in 99% of phones is a fraction of a standard lens, and this can cause limitations that AI is not currently capable of handling.
If you have any fingerprints, dust, etc on any part of the lens, it will create blooming or flare spikes as examples have demonstrated. As DigitalMonkeys has stated, the lens gets dirty quickly, even after the replacement, which tells me this camera setup, whatever coating is used, attracts dust particles, and builds up FAST. Atleast for me, I just wipe the lens down with a micro-fiber cloth and afterwards I don't have any issues with bright lights