Screenshots obviously don't show any issue. You again sound condescending. A lot of people notice the dust issue with regular use as well. Please try to be more empathic.
I still question calling it dust. That word "dust" carries with it assumptions that are all together , NOT PROVEN". Like it came from outside the phone, through a switch opening. Sucked in by pressing on screen, etc.
The picture I just saw, does NOT look like dust I have experienced. The particle is way larger and appears more like some flaking off of a coating. I realize this forum is for speculation and rumors, but making wild ass claims about origin and mechanism of transport of some particles based on sight or area of screen seen at is, shear speculation. Doesn't make it true, no matter how many times you repeat it. This isn't Faux News.
So if others of us, don't have the issue, and report that. Or question the conclusions victims of this defect make it is neither condescendingly nor inappropriate. This is a
forum for discussion. Not a complaint department. As for your statement "a lot of people", how many is that exactly? 5, 10, 100? Based on my reading of this thread it appears to be more like a hand full of people. Vocal yes, but since hundreds of millions of iPhone are in existence, the percentage of people experiencing this issue seems to be far right of the decimal point.
I would like to know what is causing this, what the particles actually are, and why a few iPhones have this issue. I feel for the people that paid good money and wanted a pristine device and find they have a blemish to their dreams. Not being condescending here. I would feel bad as well should this issue appear on my phone.
However, if you want to cast stones on other people's comments, perhaps you should remove yourself from your glass house. Stick to facts, which there are few of, in this thread and allow people to have varying opinions about this issue without you berating them because they report their good experience thereby level setting this issue a bit.