The scan lines, flicker, what you call it is very obvious to me. In fact, it's what distracts me more than the yellow tint. It makes the blue toolbar in Safari and the mail apps, as well as other patches of color, appear pixelated. Lower res. It's distracting b/c as you move your gaze, the phenomenon appears to appear out of nowhere, only to disappear again. 100% it's not overly sensitive eyes. But to each his own.
I continue to maintain that if Apple is going to charge us more than the competition, and they want to be known as a premium brand, then they need to put out premium products. If they did not freely paint themselves as such, then I probably would not care.
The interlacing issue is corner cutting, but maybe they will say that it is within spec. Cheap panels produce the interlacing. (ok I have no proof of that :>) However, I definitely do not consider it to be within spec. I too did not see it on the display models, but I have on every phone I replaced until my 4th. I have a chip in the aluminum on this 4th phone, but I don't really care as much about cosmetics, although I would have no qualms about exchanging again if I change my mind. If others have no chips in their phone, then why should I? And if others think it's OCD, then why is this the only phone that I've ever bought that has come scratched right out of the box? Other companies can produce phones without finishing problems. And even if Apple thinks that these defects are within spec, that's what the 30 day refund policy is for. The customer gets to be a PITA for 30 days; after that, Apple can be the PITA back. Seems fair to me.
They are still making plenty of money on returned phones. They are still net positive even after the returns process.
So yes, the interlacing screen issue is a real defect. I wish that someone who is actually well-versed in screen tech could say what causes this.