No they are not defects!!! If you strongly believe that then return your phone for a refund or exchange it 20 times while looking like a fool. Of course there are variations but to call it a defect is straight up nonsense. And oh yea any pics of a XS Max that has a perfect screen to you that you’re hunting for that’s not piss yellow? Let’s see it and compare it to a X.
Use whatever word you want, unless it is visually indistinguishable from an X, it's not within specs.
Like I said, not a single person alive could tell the diff between 6,591k and 6,511k, including you. If you have a macbook, use the color calibration tool to compare those two points. I'll pay you $500 if you can identify the display at 6,511k 5/5 times.
If you have an XS that differs from wither a good iPhone X or the apple display models, you have an out of spec phone according to the numbers provided by Displaymate and should get it swapped.
How dare you question people's ability to distinguish between 6,591k and 6,511k screens. I went to Apple earlier this morning, was looking at a display model (XS Max 256gb) and I judged that the screen probably fell right along the lines of 6,591.874k. I promptly turned my nose up in disgust, judged the entire store's inventory and left. So don't come on here giving us that type of nonsense that people can't tell. You've offended me