The interesting part about this, is that Apple, a company who seems to care a lot of user experience, color, look and feel.. really ignore the color critical apps that developers would like to develop. There are several innovative apps that individuals and companies could develop around color critical workflows - but sadly not possible IF you can't control what the colors rendered, the brightness levels etc.. etc... Again, I am just speaking about controlling these items within the app developed, not a global ICC or the like setting. There are several items such as True Tone and Night Shift and others.. but I really can't understand why don't allow developers to innovate and utilize existing hardware they have in the iphone. 2 examples: ambient light sensor (ALS) and xyz sensor. The lock these under the "SensorKit" and throw away the key. Unbelievable.