The yellow screen "issue" has presented itself for at least the past five years if not longer. Apple hasn't said anything about before and likely never will. Most people don't notice or don't care, so they really don't need to say anything.
Well, by nature, changing the color temperature of the display does indeed change every single color. You're not just changing one single color, you're changing the way that all the colors relate to each other. (Not sure if that's the best way to describe it, but there it is).
Now, does it affect battery life? No clue, but I wouldn't think so.
Yes but some these pictures people are posting here are yellow tint and some even more yellow tint than others. It not quality control the yellow tint is like this color the yellow tint is at all. Some have more yellow tint than others and some really yellow.
No quality control at all making the screen and setting the color.
How can the yellow tint contrast so much. Like I say some have yellow tint and some yellow tint worse than other yellow tint. No No quality control.