You are also the Nr. 1 voice against what you perceive are yellow screens.
Smetimg tells me that you have never seen an accurately calibrated screen in your life, much less having done professional level photo editing AND printing jobs. If you had, you wouldn't call those screens yellow.
Photography pros laugh in your face over statements like this.
I do high end professional photo editing for well known photographers and I spent over 100 hours calibrating my own $4000 photo editing display. The iPhone with a yellow tint is NOT more calibrated, it is deffective. Why? Three reasons:
1. Phones with the yellow tint deffect are not the "norm", and because they are not the norm by definition they are deffective.
2. More importantly, Apple clearly designs and calibrates the colors to the cooler displays. Meaning that while the grey tones will be closer to what is considered calibrated on a deffective yellow screen iPhone, all the other colors will be off, and all the other colors ship very well calibrated from the manufacturer. Claiming a yellow display is more calibrated is like someone replacing the camera on your phone and cracking the screen, and then saying they "fixed it". With a yellow phone more issues are wrong with the colors than it fixes.
3. The old calibration standards for displays are outdated. Manufacturers KNOW this which is why most TV's are by default set to a cooler color temperature instead of the caibrated warm setting, you have to change them to the warmer setting yourself. Warm displays look wrong to people nowadays. I actually calibrate displays for people by setting them to the ideal standard then adding a slight (very slight) cool shift because that is what people want and I find that looks the best personally and gets the most approval. White is supposed to be white, not yellow and people notice that.
So yes the yellow display is deffective, less calibrated, and not what the manufacturer intended.