I'm quite a perfectionist but I've honestly never had quality issues like these, apart from the 2013-era MacBook Air, where it was a struggle to find one with a flush trackpad. I think to this day not all MacBooks have it flush towards the bottom or one of the sides. I've seen one that was particularly deeply recessed into the body towards the right on a friend's M1 Air, to the point where it feels uncomfortable when you slide your finger outside of it and is kind of obvious that it's not 90deg flush even when you look at it.
This iPhone 15 is the first time I'm having issues with build quality and hardware. But the screen is uniform and very good when it comes to color. Perhaps I've never had a lemon but I don't expect every OLED to be exactly the same. Currently G9Q which would be Samsung. Don't know what my 13 had.
TBF I don't think 99% of the people would notice my two small cosmetic defects. I'm sure there a lot of iPhones out there with small defects that the owners never spot and think they are perfect. They just use the device and don't care about close inspecting it